I noticed a few Britons say "pound" instead of "pounds" when talking about amounts greater than £1.99. For example, one (Northern English, I think) woman saying something cost her "3 pound", and another (Northern Irish, I think) man saying he was billed "16 pound".
Is the use of the singular "pound" here a regional thing, or a class/register thing? And does it happen with other denominations or currencies, or with other countable objects?