Yesterday Bianca (a German girl living in my neighbourhood) and I went for a swim. We chose the from the outside really nice looking Wavelengths Leisure Centre in Deptford(http://www.leisurecentre.com/centres/58/home/Wavelengths-Leisure-Centre.aspx) for our first swimming experience in England. The inside was also acceptable. Maybe a bit more dirty than in Germany but better than expected.
We went in the evening and it was quite uncrowded.
Much to our regret the boiler was out of order and there were only cold showers ~ freeeeeeeeezing :(