Hi Joe, thanks for the info, it looked a lot simpler to me,from looking at the headlight units on ebay they looked the same as mine with regards to the fitting,the plug looks the same and the unit looks like it would slot straight in,however, I didnt realise that there were so many legal requirements, may be best to forget the idea,btw,I also have to drop the bumper on the XJ to fit a bulb,had to do this recently as the lights had condensated badly, I didnt know how to drop the bumper,it turned out to be easier than I thought,gave myself a lot of unneccesarry work in learning,eg, removed the whole splash guard.