hi.
had someone whack into my van while it was parked, and i was working

Not too bad, 20 ish yr old girl reversed of big house drive across the street and bang goes my van.
drivers door pretty dented, open and shuts though.
was taken payment at custy's door nearby.
i ran back to van as the girl's car (corsa) looked liked it was in the process of driving off

girls mum comes out and after seeing her daughter's car, started spouting off how it was my fault for parking in a stupid place :

i was parked opposite their drive by a normal pavement not a dipped drive and it was a normal width street.
the thing was the houses drive had loads of room to turn a round on.
the mother wasn't intrested in going through insurance, due to high premiums on her girls insurance.
I have notified my insurance, i'm 3rd party.
my broker past me through to help hire, who are dealing with my repairs and courtesy van.
My question is on paper work i got threw from help hire it's stats they pay for all costs and then claim back from the other parties insurance.
the thing that worried me is it stats they pursue the costs for 49 weeks and then basically if not solved, come after me for monies :

I've never heard of this is this because it's commercial insurance?
has put the wind up me a bit.
got paper work here to sign and send off.
anyone here had experience of this?
many thanks for any advice
lee