Thanks for the reply. Turns out that I told them (by text) how much it would cost to repair the car and they replied to say that they would go through the insurance route, and now suddenly they have found damage to their car and will be claiming for it. This I find odd because when they made the original offer to pay for the damage to my car they didn't mention anything about me having to pay for damage to their car. Well I have reported all of this to the insurance company and will wait to see what happens.

D