Surely my insurer should be dealing with this ?

[Toby David]

I have received a claim regarding a traffic collision which happen over a year ago, I was insured fully comp, the police attended, and details were exchanged, The general consensus was that it was 'knock for knock', Therefore I left it to my insurance to sort out. I have now received a claim from the vehicle owner stating "I was negligent", that the liability was 50/50, and "however 'quantum' for the claimant is still outstanding". Firstly, What is Quantum, and surely as I was insured the insurance company should have dealt with this. Why has this been left a year before being made aware of, and Why is the first ive heard of it, a statement of claim ? where was the pre action protocol??? Any ideas