Translated as "I can't come up with an adequate response so I'll just reply with this feeble drivel and pretend I've schooled him".
It's changed quite a lot in the last 20 years according to the census of 1991 vs 2011 (see bottom of page https://en.wikipedia.org/wiki/Ethnic_groups_in_London). I'd be interested to see how much it has changed from 1971 to 1991 if such a census existed back then.
Well I was trying to bring a little self deprecating levity to the post (failed) though I am a little busy at the moment. Stratford Races at ‘Peaky Blinders’ night. Yes, it is a little wired.