Faded plastics on these (after 26-odd years) is a problem.

The plastic headlight surround on the right is the original & complete, but needs work. UV exposure really destroys the colouring in these. The actual headlight body is rusted too. No, surprisingly, you cannot buy these any more (even reproductions). [UPDATE there is now an outstanding repro available from Gary Marsh in the UK] The one on the left (from wreckers) looks MUCH better - but has a chunk out of it (top, centre)... Curiously, the one on the left is nearly double the thickness of the plastic in some areas. The number-plate is particularly thin, on the r/h one, even before sanding. Quite 'floppy'. Both look original, so I assume there were multiple companies producing them. I wonder if the thicker one is later, with some better formula against UV? [same part number is on each]

below: I started by sanding with 60/80 grit on a little 'mouse' orbital sander, to rip that hideous grey/white faded plastic off. You really have to be pretty brutal. The fading can go deep - and that dead plastic must be removed. Yes, I suppose I took something like 0.5mm off! WARNING - the thing is now thinner, but it's still good. Tons of plastic dust, so wear a mask! (or use wet & dry by hand, dipping regularly). Now to start smoothing rather than cutting any more dead plastic.

below: mmm.. after around 4 hours (non-consecutive) work, I then went to 240 grit and things are looking rather better! Next stage will all be wet & dry (500 and up) by hand. Eventually, I aim for that factory shine! Think positively!

below: Getting better each time! Grabbed some 500 & 1000 wet & dry and spent around half an hour getting it nice and smooth. I next picked up some automotive No. 2 cutting polish. Now yes it's rather pleasing to see the result, but in fact the polishing shows up where I missed with the 500/1000 - I can see the scratches! I'll revisit and improve by going back over it and then using a nice big wool buffing wheel and polish.

below: Done. I cleaned up the guts of the headlight itself, gave it a polish and dropped it back into the surround. I think you'll agree it's a major improvement from the original state!

No, you don't yet see a front number-plate. The original is now incredibly thin/floppy and really, I'll have to surrender on that one. I'll keep an eye our for a good/better one to restore, or maybe plump for a fibreglass replica from classic_cyberglass who can now provide fibreglass side-panels and front/rear guards/fenders too. (you will find him regularly on eBay)

Oh - and the number plate story is resolved. I found a good original, I also have a fibreglass from Classic_cyberglass and I am currently using a great repro done in France - http://pureenduro.free.fr/pieces.html.