I've somehow managed to brew a bloody lovely bitter (for my first time) in a pressurised keg but now i've started drinking it, is there any kind of best before? Or do I literally need to drink 10 pints a day over the next 4 days? (not such a bad thing I guess)
Or do I literally need to drink 10 pints a day over the next 4 days?
Nope! In general, beer will get better with age. Be leisurely, and as long as your sanitation was good, it will be even better in a month or six.
Very generic rules for aging:
Higher alcohol == better aging.
Aromatic hoppy styles == worse aging
So, for example, you could age a barleywine or imperial russian stout for years because of the alcohol content. But, you wouldn't want to age something like an IPA too long because the hop aromas that make the style will degrade with age.