You have to be very careful when photographing other people's tattoos. Long lenses are fine if your subject is on the other side of the street; but if you're standing within touching distance of your quarry then usually it's the tried and tested method that works best: 'Excuse me, but I couldn't help noticing...'The lovely Harriet, it transpires, had never had a tattoo done before her beloved Persian cat passed away. Harriet gave me the green light to take her photograph, but not before she got her phone out and showed me a delightful snap of Hermes.