Some companies are said to keep a percentage of every service charge paid while others, including the Italian chain Carluccio's, expect tips to take pay up to the legal minimum.
Groups found to hold back a proportion of staff tips include Pizza Express - which keeps 8% - and The Real Eating Company gourmet food chain in Sussex, which retains 22%.
The Real Eating Company defended the company's tips policy, saying it reflected the administrative burden of distributing tips among staff.
Do you tip? What do you think of the union's campaign? Are you a restaurant owner? Do you work in a restaurant? What is your experience on tips?
BBC





) especially when things get hectic and there
are awkward or drunk customers making things worse. Note: I'm not on about the owner here, just the manager, who aren't on brilliant wages..


Every