http://www.wildcatgear.co.uk/shop/accessories/mount-skidmore-bottle-cage-adapter/
If you had some tools and and a bit of time, you could probably make something.
If you are ordering 2 or more, it's cheaper to buy them direct from Australia.
(At least it was for me. Who knows what the pound is worth now? Hopefully Australia has fucked their economy faster than us.)
@inappropriate_bike started
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http://www.wildcatgear.co.uk/shop/accessories/mount-skidmore-bottle-cage-adapter/
If you had some tools and and a bit of time, you could probably make something.