In the opening leg of the race the Celebs are split into two crews and face their first epic leg at sea - rowing 90 nautical miles from St Ives to Pembroke - battling sea sickness and exhaustion on this 30-hour row. The celebs left on land are challenged to race face fist down a 170ft cliff in order to secure luxury accommodation for their crew mates.

The celebrities tackle wild Welsh water as they row up the coast of Wales. Former politician Tom Watson confronts his fear of heights as he tackles a 130ft game of high wire catch. And the race at sea ramps up as Victoria Pendleton's competitive edge starts to ruffle a few feathers.

As the celebrities reach Northern Ireland and the Scottish islands, tensions emerge on board as the celebrities face rough waters at sea. The Blue Crew fall out over Jack Fincham's commitment to the competition; and Victoria Pendleton and Craig Charles come to blows over their competing purposes for taking part. Back on land, the crews are shocked to discover a huge game-changing prize for the land challenge which could change the entire competition.

Freddie Flintoff and AJ Odudu oversee the celebrity crews as they do battle to win a famous pair of helping hands for the next leg of the race. With the end in sight, the women go head to head on land in the toughest challenge yet - a race to scale one of Scotland's highest cliff faces.

As their epic journey to row the length of Britain comes to an end, the celebrity crews all have one final race to determine who gets to row to glory and be awarded the Golden Oar. Freddie Flintoff and AJ Odudu host the final leg of one of TV's toughest celebrity challenges.