United Kingdom
"Convert the vehicle, insure it, get an MOT, inform DVLA of the fuel type and tax class change. Take vehicle for an inspection and wait."
http://www.batteryvehiclesociety.org.uk/bvsorguk/forums/viewtopic.php?f=5&t=1465
https://openinverter.org/forum/viewtopic.php?f=9&t=543&p=6670#p6670
https://www.gov.uk/vehicle-registration/radically-altered-vehicles