Mine even with using comparison sites, direct (laughingly expensive) line, AVIVA etc still went up ~45% after cashback today. I was renewing as early as possible (most quote 30 days in advance), gone from ~£300 to ~£430 with no changes I did note was a note than mine is classed a "performance car"- it's a hot hatch which 0-60 is around slower end of most EVs and worth about half/ third compared to a new one- so perhaps no surprise EVs might be more expensive just on performance before consideration of battery, total value etc.

Anyway in case it helps cheapest for me was via TopCashBack (~£70 cheaper than via QuidCo) but did include windscreen cover, courtesy car and 5star defacto in case that helps.
There is £42 cashback until end of tomorrow https://www.topcashback.co.uk/share/...-car-insurance If you use the link and buy I may get some money back, no worries if you use it or not you can find via TopCashBack landing page and under insurance and cars. Good luck!