A friend's son got an assisted place (or maybe a scholarship, not sure) to Dulwich in 1996, which must have been one of the last places if it was an assisted one.
I wasn't a parent then, hadn't heard of Dulwich College & wasn't aware of quite what an achievement it was for his son to get the place (they could never have afforded it without the means testing) - but I do remember that back then London state schools were generally held to be dreadful places & I pretty much assumed I'd end up moving out of London when I had children, even though I love the place.
The Evening Standard
is now reporting that state schools in London are the best state schools in the country. I'm very glad that aspect has changed at least, though I expect it was investment in general that had the main effect, and abolishing the assisted places was just a drop in the ocean.
Still, most private schools do seem to have managed to find ways of running their own means-tested schemes even without government help, which is great for the children that can still benefit from that kind of education.