£17 and that’s one of the cheapest option around this area.
I looked at getting a trim at a barbers in London by my office, £35 seemed to be the going rate.
My office moved to London recently, and I found the same, cheapest place was £27 and appointment only. Quite a shock, luckily everywhere in my home town is £9, but it would handy if I could nip out and get it done on my lunch break :/