There are two sets of questions for the final chase, and the Chaser gets the one the team didn't pick. You can usually always find a seriously easy question, and a seriously hard one, in any set. Picking the easiest one from set A and the hardest from set B is not a fair comparison at all.
Feel a bit sorry for the contestant mentioned in OP -- poor person probably didn't hear the question properly, or did and then promptly forgot the start and only paid attention to "town in Bedfordshire". Under time pressure your mind can work in all sorts of hilarious ways -- my own experience was the sudden and bizarre inability to work out the answer to 1,000 divided by 2! I can guarantee you that, under any other circumstance, I'd have got the answer almost instantly -- but as soon as the clock starts ticking then the pressure can stop you from thinking clearly.