Progress...
Okay, well I almost did it right. I forgot the first time to have it on the right satellite before doing the master reset, but I wasn't far away, C4, and I knew where I was, and I had recorded all the sats I had programmed. The settings had slipped a bit from one thing and another, so I wasn't lined up quite right anyway.
I like to use G0 for 5000 because it is almost exactly due south of me, which is easier to find than G1 if I ever have to do work on the dish. So I just calculated the offset back to G0, found it and then did another master reset.
I set new limits a lot closer to my actual useful map rather than going as far as the dish would go.
I probably should have written down all the settings for the LNB, and dish type, but I guess they defaulted correct anyway, so I was just lucky there.
I've now got everything back working I think.
VoomVoom, you're absolutely right, C3 is fine, I don't know why I didn't see anything there before, but I do now...
I also dropped G9 because it looks like its just HD (which I can't get) and Wealth...
So the only sats I mapped this time are W3, GB, G3, G4, W5, G0, G5, C3, and G1
Am I missing anything important?
My map is a lot shorter now, nice not to have all the old mappings that were useless.