Matt,
That is a crying shame, car looked to be in great condition prior! The important thing is that you walked away to tell the tale with nothing more than a ringing in the ears, says a lot about the strength and safety of the car.
Insurance companies can be absolute b45tards regarding settlements and you will need police info, witness statements and admission of the other party all in writing so that you can start by defending your NCB. First settlement offers will be derisory so refuse them immediately, demand the vehicle is repaired and see what they come back with, next offer tell them to find you a vehicle of comparable or superior condition for the money they are offering, dont take trade guides as proof, tell them to provide you with a suitable replacement. Keep at them as they are very keen to take your money but not so keen to pay out! As this should be against the other party you should fight for full restitution as this was not your fault through you insurance, especially if you have legal cover.
Good luck and don't let them grind you down!!