Yep, after a bit of research I decided to go with pressure - you can de-gas your mixed epoxy prior to pouring it (and that's probably best practice) but you'll end up pouring through the bubbles that accumulate on the surface and you'll likely introduce more bubbles whilst distributing and prodding the epoxy into the harder to reach areas. I can get a pretty bubble free mix by leaving the resin/hardener standing in advance and then taking care not to 'whisk' whilst mixing - you just need to go really steady with it. By allowing the epoxy to cure under pressure, you'll hopefully squeeze down any left-over bubbles - in theory 4 BAR should give a 4x reduction in volume of a given bubble.

I bought my epoxies from Cookson Gold, you'll need:

Hardener
Resin
Colour pastes

You've also got the small quantity pearlescent effect colours - they come in pots the same size as the pastes, but they're resins and need to be mixed directly 2:1 with the hardener. In addition, a small set of digital scales and loads of latex gloves will help. Like most epoxies, it's nasty stuff so take care with it..!

Wal.