Cheers Giles. Think I may have a punt on one of the ebay specials, which will take the usual ten weeks to get here (I could do a review here, maybe?). Sadly the only torch we've got is a Maglight that takes eight D cells, which might unbalance my POA a bit if I duct-tape it to my gun. Or bend the barrel.
Good tip on the red film, I'd forgotten that any light apart from red knackers your night vision.
Take care mate,
D