@lightman: Thanks for the info re:protected/unprotected batteries, definitely worth knowing.
I used the torch on the road last night with the 1 good battery. I was out for 2.5hrs and used it 60% medium (unlit country roads) 30% low (street-lit towns) and 10% high (fast downhill sections on unlit country roads).
When I got back I ran it on high for about 5mins seeing how much of the neighbourhood I could light up and it was still going strong.
Even after waiting 6 weeks for it to be delivered and with one duff battery and one optimistically labelled battery I’m pretty pleased with what I’ve got for UNDER ELEVEN POUNDS!