All it took to open the mould was a tap with a mallet along the flange and a screwdriver to prise it open, everything came away very easily. On the back of the head quite a bit of shellac came away with the mould but this is easy to clean up. there doesn't seem to be any air bubbles in the mould and the join line looks tight but i will have to wait and see how the the cast comes out.
In this picture you can see how much shellac came away with the mould, maybe i didn't wait long enough for the shellac and the release agents to dry properly, this is some thing to think about the next time i do this. Below is a picture of the inside of the mould showing the join line.
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