I think a crown is what you wear on your head
A pound and a quid are the same though. Although the plural of quid is 'quid' not 'quids'.
(
Cuthbert Annihilator,
Tue 7 Oct 2008, 0:41,
archived)
Yes.
They're called 20p pieces.
(
Mu Dinofiddler,
Tue 7 Oct 2008, 0:43,
archived)