The Great Sport Relief Bake Off (BBC1, 8.30pm)

THE final of The Great British Bake Off became the most-watched programme of last year, with14.5 million viewers at one point tuning in to watch Nadiya Hussain crowned as winner.

The line-up for the Comic Relief celebrity specials produced four episodes won by Jennifer Saunders, Gok Wan, Martin Sheen and Victoria Wood, with judge Mary Berry ultimately picking Wood as the overall champion.

This year's all-star offering is just as impressive – the one name that might have initially had people scratching their heads is Geri Horner, until it was explained that it's the married name of one-time Ginger Spice Geri Halliwell. She's not the only former girl group member taking up the challenge, as Girls Aloud's Kimberley Walsh and ex-Eternal singer Louise Redknapp are also putting on their pinnies in a good cause.

Other celebrities venturing into the tent over the next four weeks include award-winning actress Alison Steadman, comedian and actor Ade Edmondson, singer Will Young, journalist and war reporter John Simpson, Only Connect presenter Victoria Coren Mitchell, former Shadow Chancellor Ed Balls and, from the world of football, Jermaine Jenas and Chris Kamara.

But arguably the most high-profile name of all appears in this first episode – business woman and wife of the Prime Minister Samantha Cameron. “David said to me last night, ‘I’m really worried about the technical. What are you going to do?’”says the woman up against EastEnders actress Maddy Hill, comedian Jason Manford and former England goalkeeper David James.

“I’m scared that we will have to bake something that I haven’t heard of and I won’t have a clue what it’s meant to look like,” says Samantha, who regards both Paul Hollywood and Mary Berry as “pretty scary”.

As you'd expect, she has her husband and children's support, which could be a good omen. David Cameron told Stylist magazine: "We backed Nadiya (Hussain) to win in the last series. We're hoping our support will have the same effect on Sam when she appears on The Great Sport Relief Bake Off."

He's unlikely to consider rolling up his sleeves and joining her to whip up a batch of eclairs though. He added: "I don't envy her. I'd rather fight an election than make pastry from scratch."

Samantha's first challenge is to make 24 canapes using rough puff pastry. After that, Mary and fellow judge Paul Hollywood unveil the dreaded technical challenge, which is once-against pastry-based – they have to whip up a Paris Brest.

The name alone should give presenter Mel Giedroyc some prime innuendo-opportunities, but sadly, due to other filming commitments, Sue Perkins isn't there to help her. However, the contestants will get a chance to let their imaginations run riot when they create their showstoppers – a 3D cake in the shape of a sporting trophy.

Future editions will be presented by comedians Ed Byrne, Sarah Millican and Jennifer Saunders.

Holocaust Memorial Day (BBC2, 7pm)

WITH more than 200 survivors in attendance, a unique commemoration at Guildhall, London marks Holocaust Memorial Day and remembers those persecuted and murdered by the Nazis, and those who died in later genocides. The ceremony includes personal testimony, music and poetry, with actors Sheila Hancock, Robert Lindsay, Kevin Whately and Freddie Fox taking part. Plus, the internationally renowned choir of Clare College Cambridge performs, and acclaimed violinist Jennifer Pike plays the theme from Schindler's List.

Midsomer Murders (ITV, 8pm)

AN international cycling competition comes to the Midsomer village of Burwood Mantle, but when the race leader is murdered, DCI Barnaby and DS Nelson must investigate. During the race's finale, the victim overtook his team-mate to win, leaving the team owner annoyed that he disobeyed his orders, and the rival manager disappointed that his team lost. However, as the pair look into the case, they find themselves drawn into a competitive world of blackmail, bribery and bloodshed, where winning comes at any cost.

Viv Hardwick