7 weeks ago, my wife (whilst driving my car

) was reversed into by a company (Skanska) van. The driver admitted responsibility, details were swapped and I duly called their insurers (AIG) on the monday to make a claim.
AIG said that they would send forms for Skanska to fill out to admit this liability in writing. Couple of weeks later, I had a call from the driver asking for details of the road name as he was from out of the area. He needed it for the form.
I've spoken since to AIG a couple of times for updates on the claim and they say they haven't received the form back.
So I'm just wondering where I stand legally. Am I in a position to get the small amount of repair work done and claim against Skanska directly by going down the Prelim, LBA and Moneyclaim route, or would you approach this differently?
Thanks in advance