I know we've had this before but I seem to be the only one in my (small) circle who tips. I've recently had a job done (£1,000+) and normally I would have tipped - I have to say I find it embarrassing if I tip and also embarrassing if I don't. I paid in advance for the materials so the rest was presumably labour which was high for a day's work - and the work was fine to be honest. I was warned in advance by various people not to tip as it wasn't necessary - they gave the money they wanted in the quote - so I didn't. And now I feel mean.
I'm having other work done by a chap who has really gone out of his way to help and there is no way I wouldn't give him a hefty tip when he goes even though he quoted for the job which also involved other people - who I haven't tipped.
As this is an ongoing problem for me at the moment I'm interested in what other people do and what's the norm. And, let's be honest, even a tenner goes nowhere....