1 TIDAL BAY 14-1
Veteran campaigner who finished a typically fast-finishing third in December's Welsh Grand National. Formerly trained at Crook by Howard Johnson, he'll stalk around at the back of the field before staying on towards the finish. The stats are against him though, as it's 40 years since a top weight won.
2 LONG RUN 14-1
Former Cheltenham Gold Cup winner, who has also won a King George at Kempton, and comfortably the classiest horse in the field. However, only two other horses have completed the Gold Cup and Grand National double (Golden Miller and L'Escargot) and his most recent displays suggest he could be a fading force.
3 HUNT BALL 50-1
Was the most improved horse in racing in 2012, when he capped a memorable season with a win at the Cheltenham Festival, but has lost his way markedly since. An ill-fated attempt to conquer America was hastily aborted, and having joined Nicky Henderson's stable, he is without a win this season.
4 TRIOLO D'ALENE 20-1
Outshone a top-class field that featured Gold Cup winner Lord Windermere to win the Hennessey at Newbury in November, and won last year's Topham Chase over the National fences, so demands a fair bit of respect. Flopped as he could only finish tenth in last month's Gold Cup though, a race that might well have taken its toll.
5 ROCKY CREEK 20-1
A talented eight-year-old who only progressed out of the novice ranks last season. Has come on considerably this term – finishing second in both the Hennessey and the Argento Chase – and still has relatively few miles on the clock. High in the weights though for a horse whose only wins came as a novice.
6 QUITO DE LA ROQUE 40-1
Irish raider who has failed to live up to the considerable promise he displayed at the start of his career. Finished fifth in a Grand National trial at Punchestown in February, but it's not guaranteed that he'll see out today's marathon trip. Failed to finish last time out and probably lacks the class required to make an impact.
7 COLBERT STATION 25-1
Was strongly fancied for last year's race, and was going along nicely when he unseated his rider at the Chair. Also fell last time out at Leopardstown, so his jumping would have to be a major concern. If he gets round, he'll have a squeak, but it's telling that having ridden him last year, Tony McCoy has opted to look elsewhere.
8 WALKON 40-1
Has been there or thereabouts in some decent handicaps, and finished second in last year's Topham behind Triolo D'Alene. A swing in the weights means he's well treated with that rival, but his only attempt at a marathon trip in the Scottish Grand National saw him pulled up. An unlikely stayer, although not without each-way hopes.
9 BALTHAZAR KING 25-1
A two-time winner of Cheltenham's Cross-Country Chase, so shouldn't be fazed by the Grand National fences. Looked like running a huge race last year before fading into 15th, and would ideally like the ground to be quicker than it is. Impossible to rule out, but it's 1961 since a Festival winner won the National in the same year.
10 WAYWARD PRINCE 66-1
Has twice finished second in the Charlie Hall Chase at Wetherby, but is unlikely to have the class to make much of an impression here. Is generally a safe jumper, which is in his favour, but looks to be high enough in the weights for a horse that has only won once since February 2011. Untried over the Grand National fences.
11 MR MOONSHINE 33-1
Was pulled up in last year's Grand National, but returned to Aintree to finish third over the same fences in December's Becher Chase. Trained by Sue Smith and ridden by Ryan Mania, who teamed up to win last year's Grand National with Aurora's Encore, but it would be a major surprise if he repeated his stable-mate's triumph.
12 TEAFORTHREE 8-1
A deserving favourite on the evidence of last year's efforts, when he finished third after looking a likely winner for most of the race. Has also finished second in a Welsh National, but couldn't get any closer than eighth in last month's Gold Cup. Looks extremely well treated with a racing weight of 10st10lbs.
13 ACROSS THE BAY 40-1
Led the field for four miles in last year's National, but hit a brick wall towards the finish and eventually faded into 14th. No real reason why his stamina should hold out any better this time around, although December's win at Haydock at least proved his ability remains. Unseated his rider in February's Grand National trial.
14 DOUBLE SEVEN 14-1
Has won five of his last six races in Ireland, and while it's difficult to be sure about the quality of that form, such a fine record has to be respected. The fact he has never run beyond 3m1f would have to be a worry, but champion jockey Tony McCoy has swerved other options to be on him. Should have a strong chance.
15 BATTLE GROUP 50-1
Won a handicap chase at last year's Grand National meeting, and finished last season with a flourish as he rattled up three successive victories. It's been a different story this winter though, as he has failed to finish on two outings and refused to even race on the other. Clearly has his quirks, and is surely better avoided.
16 BUCKERS BRIDGE 66-1
Irish eight-year-old who has only had ten chase outings in his entire career. Won over two-and-a-half miles at Gowran Park in November, but is taking a huge step into the unknown over a trip like this. His trainer, Henry De Bromhead, knows what it takes to win big races, but wouldn't appear to have much going for him.
17 LION NA BEARNAI 33-1
Sprang a huge surprise when he won the 2012 Irish Grand National at odds of 33-1, but hasn't really looked like reproducing that level of form since. Was a distant fourth in the Bobbyjo Chase at Fairyhouse last time out, but clearly relishes a marathon trip and couldn't be completely ruled out if something sparked a revival.
18 PRINCE DE BEAUCHENE 20-1
Was ante-post favourite for the last two Grand Nationals, but injuries meant he failed to make it to the starting line for either. Has had an easier programme this season, and looks to have been laid out for the race. Represents the powerful Irish stable of Willie Mullins, but impossible not to wonder if his best chance of success has disappeared.
19 MONBEG DUDE 14-1
Last season's Welsh National winner, and sure to be a popular choice given he is part-owned by England rugby star Mike Tindall. His jumping flaws appear to have been ironed out by some training from Zara Phillips, but his most recent run at Doncaster was a major disappointment. Forget that, and he'd have a big chance.
20 BIG SHU 25-1
A regular on the cross-country scene, he won the 2013 Cross Country Chase at Cheltenham before finishing third in the same race last month. A reliable jumper who appears to have stamina to burn, he'll have his supporters. He was running in point-to-points as recently as 15 months ago though, so shouldn't be good enough.
21 BURTON PORT 20-1
Has run creditably in some big races in the past, most notably when he finished fourth behind Synchronised in the 2012 Gold Cup. Hasn't won since April 2010, which would be a worry, but might be the sort to relish the unique challenges of the Grand National. Jonjo O'Neill should have him spot on, so has each-way prospects.
22 OUR FATHER 40-1
Only eight, which is on the young side for a Grand National winner, and has only run in six chases, so clearly lacks experience. His seventh place in the Hennessey suggests he possesses ability, but this is a big leap in class and he's by no means guaranteed to see out the trip. Was ninth in the amateur riders' race at Cheltenham last month.
23 MOUNTAINOUS 40-1
Won this year's Welsh Grand National slogging through a bog, and would be half the price he currently is if it had been pouring down at Aintree all week. Won't have his ideal ground, but should still be staying on strongly and is one of the safest jumpers in the field. One of the better each-way shouts at huge odds.
24 THE RAINBOW HUNTER 33-1
Unseated his rider in last year's race, and can be prone to the occasional jumping error. That tempers enthusiasm, although his surprise win in January's Sky Bet Chase at Doncaster following a wind operation represents strong form. Kim Bailey trained Mr Frisk to Grand National success, so he couldn't be entirely ruled out.
25 VINTAGE STAR 40-1
Fell at an early stage of the three-mile race on the opening day of last month's Cheltenham Festival, and tends to throw in at least one serious error in every race. Clearly, that's a major concern, although his form when he stays on his feet is decent. Would appreciate drier ground though and couldn't really be trusted.
26 CHANCE DU ROY 33-1
Clearly enjoys the challenge of the Grand National fences, having finished second and ninth in successive Topham Chases. Went even better when he stayed on to win the Becher Chase over 3m2f in December, and still looks to be reasonably well weighted. Should have a much better chance than his odds suggest.
27 HAWKES POINT 33-1
Finished second behind Mountainous in December's Welsh Grand National and, like his rival that day, would appreciate a lot more cut in the ground. Disappointed in his Grand National trial at Haydock in February, finishing 46 lengths adrift in sixth, but is a reliable jumper and clearly stays. Hard to see him contending though.
28 KRUZHLININ 66-1
Won two races at Kelso in the autumn, but it's a huge step from that sort of form to featuring in the closing stages of a Grand National. Could only finish seventh when stepped up in class in Doncaster's Sky Bet Chase, and while he's clearly open to improvement, would have to change out of all recognition to spring a surprise.
29 PINEAU DE RE 20-1
Has been strongly supported in recent weeks, and it's easy to see why on the pick of his form. Won the Ulster Grand National over three-and-a-half miles 12 months ago, and followed up a useful win at Exeter in January with a fast-finishing third in a three-mile hurdle race at Cheltenham. Could prove to be extremely well weighted.
30 GOLAN WAY 66-1
A useful enough horse in his youth, but was sidelined by injury for 15 months before returning to the track in February. A winner last time out in a hunters' chase at Warwick, but that's not saying much in the context of today's challenge. Hasn't faced anything like before, and is almost certainly one to avoid.
31 TWIRLING MAGNET 50-1
Took another step forward when he won a novices' chase at Cheltenham in October, but is moving in much more exalted company now and looks somewhat out of his depth. Unseated his rider in the Kim Muir at Cheltenham last month, and has done little to justify his current handicap mark. Hard to see him featuring.
32 VESPER BELL 50-1
Willie Mullins raider who has failed to complete on two of his last three outings, falling over the National fences in December's Becher Chase and unseating his rider in a three-and-a-half mile race at Warwick. Clearly, his jumping will have to improve, but even if it does, it's hard to see him landing much of a blow.
33 THE PACKAGE 20-1
Now something of a veteran at 11, but still possesses plenty of ability, even if he's not quite as reliable as he once was. Last tackled the Grand National in 2010, when he failed to complete, but ran a cracker to finish third over 3m1f at last month's Festival. Has an each-way squeak if that didn't take too much out of him.
34 RAZ DE MAREE 66-1
Has been running over extended trips in Ireland without much success, and wouldn't appear to be an obvious contender. Was pulled up in two of his last four outings, and could only finish third of five last time out at Down Royal. His trainer, Dessie Hughes, boasts plenty of experience, but his price reflects his chances.
35 ROSE OF THE MOON 50-1
Trained in North Yorkshire by David O'Meara, and handled the Grand National fences in December's Becher Chase, although was well back in tenth. Won a handicap chase over 3m1f at Wetherby in January, and while he would have to improve considerably to be considered, that's not completely impossible.
36 SHAKALAKABOOMBOOM 25-1
Finished ninth in the 2012 Grand National, but was then sidelined for the best part of two years through injury. Returned to action in January, but finished more than 70 lengths adrift as he ran no kind of race at Cheltenham last month. Would have a chance on his best form, but it's a long time since we've seen that.
37 ALVARADO 40-1
Achieved by far the biggest win of his career when he landed a Group Three at Cheltenham in November, beating a decent yardstick in Knockara Beau in the process. His form either side of that is nothing special, although he's proven beyond three miles and carries an extremely low weight. Not without hope.
38 LAST TIME D'ALBAIN 50-1
Irish chaser who finished third in last year's Topham Chase behind Triolo D'Alene. Has only ever recorded one chase victory in his career though, and that was over two-and-a-half miles. Has shown little to suggest a trip like today's will suit and hails from a stable that is hardly synonymous with big-race winners. Unlikely.
39 ONE IN A MILAN 66-1
Trained by Evan Williams, whose State Of Play and Cappa Bleu have placed in each of the last four Grand Nationals, but would not appear to be in the same league as either of those horses. His only chase win came in a Group Four contest at Ffos Las, although his fourth place in the Welsh National was a decent effort.
40 SWING BILL 66-1
Only sneaked in at the bottom of weights after a late defection on Thursday, but is not without hope having finished sixth in last year's Grand National off a similarly low weight. Has only been seen twice since, but one of those outings saw him finish fifth over the National fences in the Becher Chase. Should certainly complete the course.