Ah thanks for such quick and great replies!

Currently taking a break near to Darjeeling so I'm able to receive post, will look into one of the rear mounted light holders, seems like a good trick.

As for the front rack, I have exactly the same as setup with some inner tube and a light, but it's forever slipping down and am scared one day it's going to hit the tyres! Handlebar lights seem the way to go I guess.

Again, many thanks!
Andrew