..London is the home of Cockney Slang...but no-one around here talks like that...the odd word or 2 perhaps, but really it's becoming a very dying dialect, particularly as the population of London is predominately foreigners with their own languages and dialects and slang....rare to hear real cockney rhyming slang these days...usually when you do, it;'s a market trader calling out his wares..and more often not actually in the city but outside in the home counties, and it's constantly evolving, words being made p all the time to rhyme with other words until it makes little sense to anyone at all!!
My husband who is from Generations of London stock .. like many of his contemporaries uses the odd few words of cockney rhyming slang in everyday conversation , whereas once upon a time generations ago, their grandparents would have spoken it like a foreign language understood by no-one else in the UK other than Londoners themselves!