Yeep, was on the lookout for ages.
Hi Paul
I used this stuff: http://www.screwfix.com/p/geocel-trade-mate-mirror-fix-white-310ml/95057?_requestid=374876
Good for metal panels and heat resistant, i fitted a couple as a test, left for 24hrs and took the Z out for a drive to warm up. Couldnt shift them so looks to have done the trick. I cleaned and degreased before fitting, and used folded post-it notes to hold them in place
Just hope i never want to remove them now...
Iain.