The hairdresser I used to frequent before Covid in Bangkok does haircut and shaving for 70 THB. 100 THB are tourist prices.
A friend recommended India for a haircut for less than 1 USD. I never thought of Myanmar because my stays were all just one week, but next time I will get a haircut in Myanmar!
Addendum: Wait, you mean 0.84 GBP, not 0.84 USD? That's still slightly above my aspiration, but getting closer.