denying being involved in accident

[BobbyBobBob]

In July last year my Fiancee was involved in a car accident. As she was driving off from where the car was parked, another car was pulling out of a side car park and went into the side of her. It left a dent in the side of her vehicle, and there was no damage to the third party vehicle.
She was going no more than about 10 miles an hour as its quite a tight road with cars parked either side. The third party clearly didnt look to see if anyone was there and proceeded to pull out. They swapped insurance details as my fiancee wanted to follow the correct procedure, even though the other driver was reluctant to do so and wanted to get the repair done at his friends garage and not go through insurers. He also admitted he was in a rush for a meeting with his financial advisors. We have got his name, address and the rest of his insurance details.
Recently, she received a letter from her then insurers who were Direct Line at the time saying 'the third party have denied being involved in the accident, and to draw out a sketch of exactly what happened along with the other car details,' which they should already have when she first informed them about the claim.
She is worried that if this guy denies being involved and the matter doesnt get resolved then she would have to pay the excess and it will go down as her claim.
Whats the best thing to do to make sure this works out in her favour?

Surely the guy cant just deny everything and thats it.

Thanks

[bennhoughton]

presumably you have had the car repaired? where was it repaired? did you repair it via your insurers?