Wildswim: Semer Water is a shallow lake, near to Hawes in North Yorkshire. Ideal location for nervous newby outdoor swimmers to get used to wetsuits and swimming outside. Fabulous countryside all around. Parking is by the lake, payment (�2 for the whole day) to be made to the local farmer as the lake is on private land.
One of the local triathlon clubs uses the lake for training, and on some days there are boats out (not on either Saturday that I've been there recently).