"A jar" just means a drink. Any quantity, any drink. "Do you fancy a jar?" "I'm off to have a few jars". But you'd never order "a jar" at the bar that I've never heard. You'd say "a pint of bitter" or "a pint of Guinness" or whatever the name of it was, or a half pint. If you didn't specify the quantity the barman or barmaid would probably take it to be a pint, but might check. Or you might ask for a bottle of whatever you wanted instead of draught.

And when it comes to draught in England anyway, there's a big thing about what sort of pump you get it out of - it's almost a religious thing with some people. Mind it does taste a lot better out of a handpump.Click on this to find out all about that stuff.

You can get draught beer to carry home in any normal pub. Either in special carry-out plastic containers they have - or just bring in a jug and they'll fill it. This is less customary than it used to be.

I know they used to drink Guinness from buckets at one time at parties, but it's not the best way. Goes flat.

It's a hot night, and this is making me thirsty.

I felt there was a tongue-in-cheek aspect to Angela's Ashes that a lot of people seemed to have missed., The way it was always raining. A touch of Flann O'Brian's The Hard Life.