My hairdresser owns the business. Therefore (in keeping with a convention that many don’t seem to know), I don’t tip her. I give £1 to the girl who washes my hair, and if someone else cuts it because my hairdresser is away, I tip her £2. My hair is short and not coloured. When I had it coloured I tipped £3, plus the girl who washed it.
There are some very generous tippers here. As an aside, my Spanish tutor worked as a waitress for a while when she first came to the UK. She said that she felt offended when someone gave her a tip as she felt it was patronising (no one tips in Spain), as if the customer was giving her charity. She said she was on minimum wage, but felt she earned a healthy salarly. She was horrified that I tipped in restaurants. She pointed out that, since I am retired, even someone on minimum wage probably doesn’t have less money than me, maybe more and that they are being paid for their work! Something to reflect on perhaps.