That's another difference between the UK and just about everywhere else...We don't generally tip, except taxi drivers in London, where a 10 to 15% tip is customary.
And you don't have to worry about nasty surprises at checkout either. "You know that room you
thought you were paying $99 a night for...It's actually $112.86 a night due to there being 14% room tax." (Adams Mark Philadelphia, RIP)
Cheers,
Southie, who'll stop rambling now, honest