Here's a thing. I noticed a couple of weeks ago that there was condensation inside my offside headlight so I though I'd just pop off the rear cover and let it dry out. I reached into the very restricted area, popped off the cover clip and found that there is no room to remove the cover due to all the pipes etc. I left it for a while to dry out and then found that access is so limited that I could not get the rear cover into position to re-fit the clip.

I then went over to the nearside to see how that is fitted since it is more accessible. I placed my left index finger onto the raised arch of the clip and pulled to release it and - my finger slipped into the clip at the moment it slipped upward to release trapping my finger by the upper finger joint - it was agony and I was stuck fast with the clip seeming to tighten against the headlight body if I moved.

That was it. I was reduced to shouting my wife from the driveway as I could do nothing and was worried about losing my finger due to restricted circulation. My wife responded and she fetched a pair of stout long-nose pliers which I managed to work in next to my trapped hand and by pulling the clip upwards with brute force I could just about get my finger out. I suffered some nail damage but nothing serious.

If I had been working alone I would have lost my finger or worse. If you are working on Ka headlights like these, never let your finger go into the clip, always have a phone in your pocket and keep a pair of stout long nosed pliers within reach. I did eventually get the covers back on but it took forever and red hands. What a nightmare.

I seem to recall that on some Kas (certainly yr 2000) the accepted method of replacing a front bulb involves removing the front wheel. But I once managed to change a bulb without removing the wheel, but it was indeed very difficult. 

A useful warning, thank you.