It's improving.

There might not be much of a market for true EV supercars, but that market is so small as to be inconsequential anyway, with many models selling 10s of units and many of these cars never actually being driven significantly.

In the 'high performance but actually driveable' toy zone, there are plenty of Porsche Taycan 'company cars' around London. But sports cars are niche. Lots of rich people drive SUVs, and there are plenty of Porsche / Audi / BMW, etc, SUV EVs around outer London.

EVs will keep getting cheaper as China puts pressure on the market and as the number of EVs on the roads increases. In the UK, you can already get a second-hand VW ID.3, a great EV, for well under £15. And new cars from BYD and MG are available at ever more reasonable prices.