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”
Tesla M3 “Harry”