@PiggyPokkyFool
Thank you for your reply. I have already spoken to imperial and there's no flexibility on offers. I doubt if they'll listen to a teacher in the current state of affairs. We are appealing and if that doesn't work then she will resit in either autumn or summer. Imperial will reinstate the offer (no new interview or bmat needed) once she reapplies on UCAS.
Of course if she been given AAA then she would have been perfectly happy with bristol (her insurance). Although she would still have been very disappointed with the A in maths. And as a maths teacher myself, I know she is an A* student.
Well done to all those DC with their place.