As I said above too much choice and so many varying specs/attributes. Then I remembered I didn't want it to shine across the channel or take it into space and the most important things for me were... AA batteries so that I keep all my portable devices on the SIB to the same battery type.... properly waterproof not just spashproof... rugged plastic body... keep to under £25 posted.
So I bought this Unilite....
Unilite Prosafe PS-T1 275 Lumen 30m waterproof LED torch
Just about met my 150mm length requirement at 165mm... waterproof to 30m... shockproof in 1m drop... 150m beam... 4x AA batteries... cree bulb... 2 modes ON or SOS... button lock so it doesn't come on in a bag or pocket... 7hr battery life when on or 35hr in SOS mode... decent size lanyard.
Normally £25+ with postage but found a guy selling one he'd never opened/used at £15 inc post so a good deal.
Comes with O-ring grease showing they're taking the waterproofing seriously.
One more small thing sorted for the 2017 season.