Thanks for the feedback everyone!!
I've seen those fuel bladdders before, apparently it was the Surf Lifesavers use for their RIBs, so pretty tough and can cope with being in the sun all day. But....I don't really want to spend the money, although I am very tempted!
I tried fitting the metal jerry can at the weekend and it will rattle a LOT against the rear rack and will no doubt drive me mad. So I think based on that, plastic it is.
Cheers again
J
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