I'm in the UK too.
I used 'Fastglas' resin that is for automotive fibreglass repairs, I think this is polyester. It cost around £13 for possibly a litre and I bought some fibreglass tissue at the same time. I put a couple of layers of tissue in the mould, painted them with mixed resin, put in the coils, filled with resin and then put on more tissue followed by the lid.
I had to very quick because it set in around 15 mins.
One year on it's still ok, but I have a feeling that it's slightly brittle stuff and I'm usually quite careful handling it, perhaps needlessly; it could be much stronger than I think.
You get what you pay for of course, and I didn't want to pay a lot, trying to make the turbine on a very tight budget. The only other options I could find were buying large amounts of stuff or very high prices.
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