Did the 1500m open water swim Buttermere swim (utterlybuttermereswim.co.uk) last Saturday. Martin did the 5k, there was also a 10k. It was great. Best lake I've swam in so far, much better than Derwent, Coniston or Ullswater, water was clear and warmish. It was quite low key event very much like a fell race. There are bigger organised swims like Great North Swim, this weekend in Windermere, quite commercial like Great North Run, wouldn't do that. Epic Events also organise lake swims. Everyone is very friendly