> I mentioned (in the rhyming slang bit) the term "pony" meaning 25 - there are other terms depending on the size of the
bet. Does anyone know any others?

Yeah, sure. I know that a 'ton' is 100. There's a 'monkey' which I think is 40. Should be plenty more.

On the same topic, where did the bookies language of 'tic-tac-toe' come from?