Vanoord's beastie is similar to the one I've got, but a bit posher. Mine is the original type with a cap on a chain, and a clear plastic fuel reservoir. As I said in my original post, they're pretty tough although I have seen some cheap copies kicking around. Phil at Caving Supplies had some for a while but he's stopped stocking them as they were a bit problematic.
Follow the horses, Johnny my laddie, follow the horses canny lad-oh!