Nigel glad to be of assistance to Mrs Nigel for looking after us.
As much as you can tell with the tube in the car, I don't think its bent. Sighting along it as best you can, it looks to be true.
At best the flange on the tube is bent ~0.5mm inwards at the bottom left. However the flange isn't perfectly flat anyway. It has a 'hump' in it, presumably from heat distortion from welding where it has been welded to the tube.
I would have thought that the entire un-restrained (left hand) side of the flange would be significantly distorted before a tube itself bends.
TBH I have not inspected a known good tube for accuracy or flatness, but from what I could see the damage is very minor.
If anyone has a DD tube to hand, perhaps they could measure how flat it actually is?
To be 100% sure it would need to come out, but I expect, having seen it, a new ear appropriately shimmed followed by a geometry check would suffice.