This part is wrong, bi-xenons are factory facelift headlights, if he had those, he wouldn't have to upgrade Also, cars with prefacelift lights which are xenons, have an 8 pin connector, so that means ALL UK cars have 8 pin connectors. The only cars that may have 6 pin connectors are those from the USDM and JDM, I expect all EUDM cars to have xenons too, but I can't confirm that.
So yes, facelift headlights are completely plug and play in all UK cars
Thanks very much for the clarification. So all UK cars had the 8 pin! So as far as right hookers are concerned, only JDM halogen hi-beam will be 6 pin, right? We have euro cars here which are halogen hi (and 6 pin), so it must be a uk thing.
The high beam isn't relevant, the main beam is. JDM can come with or with xenons and the headlamps look the same, the high beam in prefacelifts is always halogen and the main beam can be too. If EUDM cars are the same, then the 6 pin models will have halogens as main beam, not xenons as the extra 2 pins is for the self levelling control that xenon lights require.