A correspondent has asked me about the practice of giving a small tip to bar staff by saying “And your own” or “One for yourself” when paying for a round. This, as far as I know, is something unique to Manchester and the surrounding areas and I have never come across it anywhere else.
Perhaps it is a hangover from the days of waiter service, although that was certainly found in other parts of the country. It’s certainly something I would associate more with the older generation of pubs and pubgoers, although it’s still fairly commonplace.
You probably wouldn’t offer a tip for a single drink, but maybe for a big round, or if you'd been there all night, or if you'd received particularly good service from a specific member of staff. 20p would be par for the course, maybe going up to 50p for a large and/or complicated round, but anything more would be taking the piss.
It’s something distinctly different from offering to buy a drink for a member of staff, which in any case is often frowned upon nowadays.