OZEV Office for Zero Emission Vehicles (previously called OLEZ). They have guidance for the full range of government grants and incentives including aspects of owning an EV which include:
The PICG (plug-in car grant) to help towards buying an EV. See which cars are eligible here: https://www.gov.uk/plug-in-car-van-grants;
Further guidance is here: https://www.gov.uk/government/publications/plug-in-vehicle-grant-portal-guidance
Workplace Charging Scheme (WCS);
Benefit in Kind (BiK);
Business leasing;
Salary Sacrifice scheme;
No VED (road tax) to pay;
Capital allowances.
See: https://www.saffery.com/news-and-events/publications/tax-benefits-of-electric-vehicles