OK, here's the best I can manage. Gave up on correcting the distortions on the "joiner" as the distortion in the top and bottom halves was just far too different between the two parents. I've gone back to the single image I took, and just removed the distortion as best as I can from that. Still a sod of a building though. Nothing is as square as it seems!
Thanks to all for your advice on how to do this, it's been most helpful.
Regards,
Duncan
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