THE best of today's TV offerings.

Wimbledon 2018 (BBC Two, 11am)

It's been a great few weeks for sport fans, with the FIFA World Cup in Russia capturing the nation's imagination, England's cricketers breaking records against Australia and the best racehorses on the planet taking to the turf at Royal Ascot.

And the highlight of many a British sporting summer gets under way today as the British public goes tennis crazy again for two weeks and the usually quiet courts across the country are full of amateurs wielding rackets and chasing balls.

Yes, the oldest and most prestigious tennis tournament in the world, The Championships at Wimbledon are about to begin and it promises to be another thrilling tournament.

As is customary, first up on the exquisitely creeper-clad Centre Court will be defending men's singles Roger Federer.

After missing the clay-court season for the second year in a row, the Swiss superstar - who is approaching his 37th birthday - will be hoping he is rejuvenated enough to mount another defence of the crown he has made his own ever since he first won his first title way back in 2003.

In 2017, Federer surpassed the seven titles won by William Renshaw and Pete Sampras without even dropping a set, and it could be the same again this year.

His main threat is likely to come from Rafael Nadal - if the 2008 and 2010 winner and newly crowned French Open champion is fit, that is.

Nadal isn't the only leading man facing a race against the clock to prove his fitness. Two-time Wimbledon champion and former world No.1 Andy Murray made his competitive return to action at Queen's Club a fortnight ago after almost a year out with a hip injury, losing a tight three-setter to Australian Nick Kyrgios.

Perhaps now is the time for fellow Brit Kyle Edmund to step forward and prove he is good enough to make it to the latter stages at SW19?

In last year's women's draw, Garbine Muguruza won her second Grand Slam singles title with an impressive 7-5 6-0 victory in the final over Venus Williams, who was attempting to win her sixth Wimbledon title.

The Spanish champion is likely to be a contender again this year, while Petra Kvitova, Maria Sharapova, Angelique Kerber and Serena Williams, who gave birth to her first child last September, are also likely to be in the mix.

British hopes largely rest on the shoulders of Johanna Konta.

Last year, after two decades of willing the likes of Tim Henman, Greg Rusedski and Murray though to the second week, British attention turned to the women's singles.

Following encouraging runs in Melbourne and New York, Konta finally brought the best of her offensive baseline play to SW19, winning a thrilling quarter-final against Simona Halep.

Aiming to become the first British woman to reach the Wimbledon final since Virginia Wade in 1977, Konta's lack of experience on the biggest stage was eventually exploited by Venus in the semis.

This year, as usual, all games will be shown live on the BBC - and not just those on Centre Court and Court One.

You'll be able to follow every match from around SW19 on the red button.

So pour yourself a cold Pimms and dish out the strawberries and cream - the highlight of this and every sporting summer is about to served up.

Food Unwrapped (C4, 8.30pm)

Jimmy Doherty is on a mission to find out why jelly won't set if you add chopped papaya to it. He could probably find out the answer in a kitchen or a laboratory in the UK, but as this series is nothing if not thorough, he heads to South Africa, where he discovers that it's all to do with the fruit's enzymes, which can be used to tenderise meat. But could they also help the human gut? Meanwhile, Kate Quilton is in Hawaii for a tuna auction to learn why some fish have dangerous levels of mercury and others don't, before she heads to San Francisco to meets the people who are growing fish flesh in a dish. Finally, Matt Tebbutt asks why the ice cubes made in the freezer at home are usually cloudy while the shop-bought versions are clear.

The NHS: A People's History (BBC4, 9pm)

The Last Leg's Alex Brooker presents this three-part series which charts the highs and lows of the NHS through mementoes belonging to the staff and patients whose lives have been changed by it. The opening episode concentrates on its first 25 years, and features a graduation certificate of a doctor who qualified on the NHS's first day and was thrown straight into surgery. There's also a look at the prejudice some people faced in the service's early days as actress Joan Hooley shares her copy of an episode of ITV drama Emergency Ward 10, which caused shockwaves by featuring a black, female doctor.

David Walliams Presents - Return of Alright on the Night (ITV, 9.15pm)

Now that clips of on-camera mishaps can be shared around the world online, is there still a place for It'll be Alright on the Night on TV? Well, if anyone can persuade us there's still life in the format (which many viewers will forever associate with the now 96-year-old Denis Norden), it's David Walliams. Here, the Britain's Got Talent judge, children's author and all-round one-man-entertainment industry will bring us a selection of classic outtakes, as well as some brand new clips. And if that doesn't sate your appetite for watching TV presenters get it wrong, there's a second edition showing on Tuesday. But the question remains, will Walliams have inherited Norden's trademark clipboard?