Cheers Dean! very helpful as ever :)

The plan is to pour it on sunday and then leave it for probably near on 3 weeks as I will be away with work so cannot do anything on it anyway so figured this would be the best option. I am planning on making a sort of tent around the machine and using a 3kw oil radiator style heater on a thermostat to try and keep the temp up. I prefer these to the fan type as at least they are sealed and there is no exposed heating element. This way i am happy to leave it on for extended periods and not worry too much.

I will pour a couple of samples of any remaining material as tests as well so thanks for that. I will look out for the "Snap" test once I am back.

Any suggestions on where is a good place to have a made to order length timing belt? I have yet to find one