This is a good site for seeing the differents UK models, and their prices, that are on the market or coming onto the market.

These are all models under £20,000 - https://ev-database.org/uk/#group=vehicle-group&av-1=1&av-23...

There's also a large number of used EVs available. Here's a selection of 2024+ models between £8000-£10000

https://www.autotrader.co.uk/car-search?channel=cars&fuel-ty...