Cups are a bit of a pain because everyone uses a different one - England has one that's about 1/2 a pint, America uses a 230ml one, Australia 250ml and Japan uses 200ml. (But aside from the Japanese ones, they they seem to come to *about* 1/2 a pint.)
A teacup is usually about 200-250 ml, a small mug might be about 1/2 pint. It might be worth stealing a half-pint glass from the pub, actually or measuring how much liquid a certain cup you've got at home holds, working on the theory that if it takes oh, 1/4 of a litre or half a pint then it's *about* a cup. Most of the time, consistency is more important than the exact size so you should be fine with a teacup.
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A teacup is usually about 200-250 ml, a small mug might be about 1/2 pint. It might be worth stealing a half-pint glass from the pub, actually or measuring how much liquid a certain cup you've got at home holds, working on the theory that if it takes oh, 1/4 of a litre or half a pint then it's *about* a cup. Most of the time, consistency is more important than the exact size so you should be fine with a teacup.
But I've also had a look on Amazon - you're in the UK, yes? http://www.amazon.co.uk/Faringdon-Stainless-Steel-Measuring-250ml/dp/B0000BVF6O/ref=sr_1_1?ie=UTF8&s=kitchen&qid=1244117244&sr=8-1
http://www.amazon.co.uk/Betterware-Soft-Grip-Measuring-Cups/dp/B0014QT26M/ref=sr_1_6?ie=UTF8&s=kitchen&qid=1244117244&sr=8-6