Ah I run around that area when I'm in the office! Always love seeing that house with the garden right on the edge of Hosehill lake. Ideal.
My favourite lake is home to one the largest freshwater fish in the uk which adds a bit of spice to swims there
The big gravel pit the sailing club use? Carp aren't much of a threat to swimmers, but don't let the fishing club see you disturbing their swims!