Dry Mount for gum

Hello all. I'm trying to locate some 'Fusion 4000' dry mount tissue here in the UK so I can mount the paper I will be using for gum dichromate onto it's aluminium base. Does anyone know where I can get sheets of it instead of huge rolls or indeed if there is an alternative ? I was reading the Unblinking Eye article on Keith Taylor (Article) and would like to try this way of mounting.

SPG