Thanks Rossi, I don't think it's that bad, and would be very surprised if it is written off, but just want to cover all eventualities. Luckily I have it on agreed value so they can't quibble on value.
The car was parked and the third party tried to parallel park, and didn't stop, got out of her car saying her parking sensors didn't go off, so obviously wasn't using her mirrors! The car hit directly onto the exhaust, pushing it in and down, so some relatively minor clam damage under the exhaust, but has snapped the main hanger mounting point on the silencer, so not sure if there is any other damage yet. It's going to Back on Track for repairs next week so we'll see what they say, but they said I could be looking at a new silencer.