August 1 2013, hottest day in London for 7 years. Walked and sweated for over an hour in my trousers (as that was after I finished work at the time) and T-shirt, saw loads of bikini-clad sunbathers as is normal during "heatwaves", and when I was ready to go home, I saw another woman wearing only her bikini, short skirt, sunglasses and sandals getting on a packed train on the Gospel Oak to Barking line
Hot and sunny makes me happy that's for sure.