Ant McPartlin and Declan Donnelly have given I'm A Celebrity producers a tough task with their list of dream camp mates for this year's series - putting British astronaut Tim Peake at the top.The Geordie duo are returning later this year for the 23rd series of the hit reality show and according to a source, the former military man-turned-space explorer is number one on their wish list.The 51-year-old, who was the first British person to walk space, would join former footballer Roy Keane and The A Team actor Mr T if the pair get their way. "Both Ant and Dec think Tim would be a fascinating signing for the show and bring another layer to the campfire chats," a source told The Sun. According to the source, the pair think Tim's presence around the campfire would give the show some real "gravitas".