Cycled to sinuous bend in the Wey, just downstream of Godalming. Recce'd the scene at first : bright, sunny, nice breeze, occasional towpath users and the odd boat. Various fowl splashing about, cows on opposite bank being cows. Checked out the getting in and out place. Got down to shorts and read the paper for a bit, to gauge traffic, and to see how hot it was (quite, but not summer of 76 exactly). Stowed all keys, phones and things of economic significance away from casual fingers.
Waited for a quiet gap. Sunnies off. Hat off. Kit off. Walked in. It! Was! Cold!
Did a length or two. Didn't feel like dunking the head, given the (perfectly natural) detritus on the surface. Fingers gettting numbbbb. Quick get out.
Back to the towel. Sit there for a bit. Dried off. Waved to passing boats : oh look, a shivering naked person, titter titter. Cycled home.