Can someone please tell me where to find the reversing light switch on the gearbox. The lights or rear wiper dosn't work, checked fuse ok. Cant find the switch.

You're going to leave us guessing which engine you have aren't you

OK, I'll start- I guess it's a diesel

I changed mine last week as had the same plus no parking sensors.
If it is a JTD then the switch is on the right hand side of the gear box when viewing the car from the front, ie at bonnet.
Jack up the n/s, remove wheel, remove undertray and n/s plastic engine cover. Now you can easily get to the switch with a 19mm recess ring spanner. Just unplug the connector and unscrew the switch.