Bit of dry weather so I gave it a wash and decided to sort the number plate bulb that's been out for a month.
Took bulb out, put it on tester was ok, checked terminals in light fitting, ok put bulb back in, not working, bulb out, check repeat about 6 times
Put bulb direct to 12v nothing.... move bulb about abit (?) and bingo! we have light
Cleaned ends of bulb with a bit of emery paper back in car and still works, so don't really know why the sod wouldn't work.
Anyway, a nice 30 minutes in the spring sunshine.