I wouldn't tip a Toni and Guy hairdresser, they cost enough as it is. Although I probably wouldn't go to one either as I find them intimidating. It's difficult to find a good hairdresser, I had a terrible cut last year because my previous hairdresser was on holiday and I thought I would go to someone else... not sensible. Now I'm very cautious as I am trying new hairdressers so will not ask for anything too adventurous until I find one I feel completely happy with.
It will be hard to live up to previous hairdresser though who is wonderful, but I really can't afford another £189 for a cut, colour and blow dry no matter how nice it looks!