Thanks all. Will be careful not to overtighten the fixings.
I agree with a James ref the aftermarket ones, I bought the LED lookalikes off fleabay and had to slightly enlarge the wing apertures to fit. They looked nice and made the car look less cross eyed but the beams were all over the place plus lack of adjustment. I had to replace the originals for the MOT.
Thanks Taffmog. I have bought a pair of aftermarket replacements. I steered clear of LED because, as you have said, you normally get zero adjustment and for some reason they are all always crap! So have gone with a set that take a standard h1 bulb. The plan was to rip them apart. Color match them to my car and then install. Will see how it goes!