• Alright Mate, Can you speak London Slang?..This test will see if you understand terms, expressions and London cockney Rhyming slang.All these expressions are used in the british capital, some more frequently than others. If you visit London you will benefit from knowing some of these colloquial terms, after all we don't all speak like the Queen you know!!.....i personally only use a few of these expressions sometimes, i am not a full blown cockney.