Wildswim: A lovely tarn nestling amongst trees and gently rolling hilltops near the South end of Lake Windermere. High Dam is a fairly large tarn (approx 300m by 200m) with lots of areas to get in, some rocks to jump off, hidden bays filled with lilies, and a couple of nice islands.
It is not particularly deep and is sheltered from the wind, so it doesn't get as cold as some tarns. A great place for a quick dip or a whole day spent lounging around, but it's also popular with walkers so skinny-dipping needs to be done with discretion.
John Belshire: Beautiful spot. Swam July, no need for wetsuit.
Suzanne Lozey: Lovely peaty freshwater, sheltered and balmy; indeed warm at the moment!