On Thursday we were in Russell Square. My son was keen on the fountain (it is one that you can walk through, set into the ground) and it was hot so I stripped him down to his nappy and let him run through the fountain.
The mix of reactions was quite strange. Older people smiled but the younger office worker crowd looked a bit shocked and disapproving.
I was with him all the time and went in myself (wearing shorts). I had a towelling jumper to shove on him when he was done so he didn't get cold.