As an update. The equipment arrived yesterday, I connected it up with the 'dish' sitting on a bit of rough grass at the side of the house, and it all worked straightaway. It's only set up roughly, not optimised, but I'm getting 90mbps for the same cost as the 10mbps on the copper line. Starlink took the first payment yesterday, they're quick, but it was only £23, so I'm not complaining. I was amazed at how simple it all was. I've just got to get a bracket to mount it on the wall.