That would be a ton.
In Victorian England.
Cockney slang similar "Bird" & the Americans "Chick", the Aussies "Shelia".
The Cockney rhyming slang works by making use of the several sounds made by the upper lip and the lower lip in conjunction to having other sounds made by the tongue.
Cockney Rhyming Slang is prevalent in dialects of English from the East End of London. Cockney Rhyming Slang is said to have originated in the market place so vendors could communicate to each other without the customers knowing what they were saying. Others believe it originated in prisons so inmates could talk to each other without the guards knowing what they said.
The Cockney people wanted a way to speak to one another that other Englishmen didn't understand, so they started using rhyming slang. This was especially popular among criminals, who didn't want the police to understand their speech.
Five hundred pounds
I can't find any cockney slang called "gorilla" but a monkey is 500 pounds.
30 pounds
five hundred A monkey = £500 in cockney rhyming slang.
In Cockney slang, "trouble" is used as a slang term for "wife".
Garrett mean in cockney slang
Apple core Bobby Moore (from 'score')
A Cockney rhyming slang for Trouble is Barney Rubble.
China Plate is Cockney slang for Mate
In cockney slang, believe is "Adam and Eve". As in "would you Adam & Eve it?!?".
The cockney slang for knickers is "Alan Whickers". As in "deary, your Alan Whickers are showing!"
In Cockney Rhyming Slang, the slang for milk is Kilroy Silk, "Gotta av a drop'a Kilroy on me Cornflakes"