Thanks folks!
Riteguy, nope, didn't pressure cast. The clear resin is done by Polycaft and here's the page link:
http://www.mbfg.co.uk/liquid-plastics/fc-6600.html
They recommend it's best used at between 20 to 25C and not to use condensation cure RTV moulds.
This is where a bit of addition cure RTV came in handy on this occasion.
The none to technically put process I went through is as follows:
Warmed the resin and moulds to temp, actually warmed the resin to a bit more than 25C.
Mixed the appropriate amount which in this case was about 650gms or about 1lb or thereabouts.
Shoved that in the vac chamber and degassed the living daylights out of it.
Poured about 3/4 in to the mould and slopped it about, degassed again.
Slowly poured the rest in, gave it a several times look over mit der mark 1 eyeball to make sure I got it all and then just left the hell alone.
Moulds sat atop of my little sculpey baking oven to maintain some warmth and seven hours later, we had a winner.
Not saying that's the most perfect way to do it and I feel that some of the real casting pros out there may wince at the above description but all I can say is, well you've seen the pics so it worked out pretty well methinks.
That's most of the sordid tale and hope the above info clarifies things a bit...though I suspect not considering who typed it
Take care all!