that makes him the first prime minister in a very, very long time to have both divorced and now remarried while in office. the three peaks challenge — in which walkers tackle the highest points of scotland, england and wales, one after the other is one of britain�*s most popular endurance events. but three mountains is not enough for a pair of fitness enthusiasts, who are planning to throw in a fourth climb — in northern ireland. who are planning to throw in a fourth climb — in northern ireland. oh, and they�*re going to row between each nation. alison freeman went to meet them. their home for around six weeks. catherine and martin will eat, sleep and travel on this rowing boat between the four nations of the united kingdom, before taking on their highest peaks on foot. a challenge that�*s never been attempted before. so this is our cabin, there�*s just enough legroom to be able to lie down. i�*m here, martin�*s here, so it�*s pretty cosy. it�*s the idea of catherine wilkins, who runs a fitness centre in northumberland. despite the mammoth challenge ahead, she managed to get martin, who works for her, on board.