The Time Crashers land in AD 43 where they face their toughest challenge yet by creating a Celtic feast in two days before they return back to 2015

It's 1885 and the celebrities are in a Victorian fishery where they have to fulfil a huge order for Billingsgate market, but the conditions are harsh and the work is backbreaking.

It's 1796 and the celebs are Georgian farm workers. The men must ensure the farm and animals are scrubbed and spotless ready for the Viscount's visit, while the women are busy baking.

It's 1913 and the time crashers are servants at an Edwardian stately home that hosts a shooting party

In this episode, the time crashers find themselves in 1468 - the golden age of chivalry. They all take on the role of male squires in the service of two knights who will go head-to-head in a joust.

The time travellers are stripped of their celebrity status and plunged into 1588 to be servants in a great manor house. They receive a crash course in Elizabethan etiquette, deference and servitude.