Hi John
As Graham mentioned my Plus Four has got a cigarette type socket under the dash on the left hand side. I have a suitable adapter plugged in which allows a USB. It never worked for the Ctek unfortunately…
I now have the adapter socket/leads permanently attached direct to the battery (I think it came in the box with the charger) which means I can simply lift the bonnet and plug Ctek straight in. No hassles at all
Kindest regards
HB

Plus Four Bentley Velvet Red “Grandi P”
Golf ehybrid thingy “Toadie”
Polestar 4 “Vger”