I found a Alan Harper Distributor here who also provides silicone vacuum bag creation service, so I will not need to invest with equipment to make just a few bags.

I'm already arranging my first silicone vacuum bag! 

Seams like a really cool option but only if you want to produce a couple of the same parts. If you are mostly doing single infusions so the silicone way would be much to expansive I think.

yes this process is aimed at multi part production, we had a very good turnout at the Alan Harper Training / Demo last week at the NCC.

I will certainly be using it on some of my infusion tooling and possibly my semi production prepreg tools too.