I got this info via google. It's a term that is not used in N. America.
Clive
bottle - courage, *****. eg "he lost his bottle", "he bottled out", "he's got a lot of bottle". The most common explanation of this term is that it comes from the Rhyming Slang 'bottle and glass' - '****'. ie. To lose one's bottle, to lose one's **** (