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did manage to get under the car at the weekend and locate the switch.
was on my own and didnt have any mirrors handy so not a great deal i could do other than see that the wires were connected! Next time will take the wires off the switch and touch them together and see if (hope that!!) the lights come on.
If you do touch the wires together and lights work fine, and then try the switch and it works fine, sometimes the pin which is pushed outwards by the reverse gear selector rod gets kinked and then sticks in it's bore. I replaced it with a 3.5mm drill bit (needs to be hardened steel) cut off to the correct length (about 25mm)-works fine now.
-(BTW, I don't remember any oil escaping when my reverse switch was unscrewed but my 'box was standing on the bellhousing -I reckon oil loss would be minimal as the hole is very small, it certainly wouldn't gush out).