Thanks to Oliver, for dropping over to help out with my first attempt to cast something other than Aluminium Mc Muffins.
Having ingots which were easy to manage made things nice and simple from the point of view of the melting.
I made a few mistakes with the green sand, including forgetting the parting dust! But the flask came apart so well we wend with it anyway.
I need to grind / file off the flashing, and then drill a pair of mounting holes.
It was a good learning experience. I could see a few things that went wrong, and I have a few ideas how to make things better next time. Video may follow, but that involves editing and uploading, so it may not follow too quickly.