According to a survey conducted by The Museum of London Cockney Rhyming Slang is dying out.

(Many people did not know the “dickie birds” (words), and the meaning of once-popular phrases like “pig’s ear” (beer), “bacon and eggs” (legs) and “bricks and mortar” (daughter) have been lost, “apples and pears” (stairs) was the most well-known Cockney phrase (78%) but only 9% of respondents said they used it in the last six months. “Porky pies” (lies) ranked as the most commonly used expression – but only 13% said it had come out of their “north and south” (mouth) In fact other forms of slang are taking over and words like “OMG,” “epic fail” and “wicked” currently rule the London lexicon.)