I love a list......for EV kits available in the UK
Zero EV
Porsche 964 £50K plus for a complete plug and play bolt in kit design for 60 hour install. Completely reversible. https://electricporsche911.com/
Swindon Powertrain
Classic Mini Kit £8850 + Taxes https://swind.life/products/cmk/
VW Beetle, Citroen 2CV, Aygo Everything EV various costs... https://www.everything-ev.com/index.php?route=product/category&path=62
Fiat 500E - Silent Classics Classic 500 EV Conversion kit
Please note, I understand the Swind e package price of £8k does not include the batteries. It may be obvious to some but not others.