Warning: the following question definitely into the Developed World Problem category.
So I was in the hairdresser yesterday afternoon and I never know what to do about tipping. Sometimes I don't tip at all, sometimes I give the hairdresser £2 or I give it to the receptionist. But yesterday a very proper looking older lady who came across as being someone who did things the right way, thanked and tipped the girl who had washed her hair as well as the hairdresser.
Who do I tip and how much?