Come on in the water's lovely

I missed out on a birthday swim yesterday. Persuaded R to accompany me on a hike/geocache/swim expedition. Here R is complaining that its cold. I'd tested it, it was 18°C, lovely. All the rest of the swimming photos were rubbish because I forgot to wipe the water droplets off the lens . I need to find a solution to this problem. 
There was a very smart pine boathouse, oh dear maybe the tarn is private. It was, but no-one to  around today to shout at us. The tarn is totally surrounded by open access land so you can't tell from a map if a tarn is private. 
We visited the Brown Horse pub again, this time to eat outside in the beer garden,  to give me a break from cooking.