I think this may well be the case. Outside of Arsenal fans in Islington play acting I think the geezer is dead in London (but alive and well in Kent and Essex)
Maybe we need to move to fucking essex then, bloody hell. My uncle's wife is from peckham but she speaks like she's from cheshire. It's honestly quite revolting. all that identikit middle class british accent has colonised everyone, it's that or you have a vague caribbean tinge to your accent. the turkish wannabe cockneys of my childhood are gone.