Fixed it! Thanks to https://www.micra.org.uk/threads/high-level-stop-light-not-working-any-fuse.59331/
Black wire was broken at hinge rubber. Bodged & fixed.
Mmm after further research it appears you only have to have 2 working stop lamps. If any additional lamps are fitted and connected then they should work.
Looks like I'll be taking it off if I can't fix it on time
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Aw I thought you were going to show us some ingenious internal power cable through the dash.
I don't like dangly cables to cig lighter socket [emoji53]
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Ordered this one...
http://www.ebay.co.uk/itm/181694759487?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Dims match the old one so should fit.
Sounds like it's coming from engine bay nearest the windscreen or maybe where the dash meets the windscreen.
I'm starting to think there may be something in the vents that rattles when I get above 20mph.
Oh right! Yeah I managed to get over 400 miles on a full tank. Had a jerrycan in the boot so ran it until it stopped. Got 75 miles after the low fuel light came on. Not bad at all.