The first time I had dealings with a claims management firm must have been in the early 90s , after a drunk driver clipped the nsr corner of my W123 in trying to go straight ahead from the left turn only lane of a roundabout ; when the police arrived we were both breathalysed; he failed and was arrested on the spot , which made my claim a slam dunk .
After phoning my insurer I was told to get an estimate, but at the body shop I was given a leaflet for ‘ 3 Arrows ‘ , which turned out to be part of Avis car rentals ; they promised to deal with everything, give me a free loan car , not ask for any excess etc .
Being somewhat naive back then I didn’t see any downside and all worked out fine .
I suspect this was initially set up by Avis as a means of generating car rentals , but it probably generated more money by screwing insurance companies with punitive charges and became big business in itself .
This is precisely what happened to me when someone hit my wife's car some 15 years ago. The driver was a perfect gentleman and immediately accepted liability. I got a call from his insurer one hour later...
When I took the car to the dealer, they offered me a loan car and said that 'they will take care of everything'. They even showed me a photocopy of an Axa policy that covered then in case the other-party insurer won't refund any of their costs.
I agreed because I trusted the dealer, they have been looking after the car since new etc.
A couple of months later I was chased by an accident management company, apparently the other-party insurer refused to cover some of their costs.
I told them I wasn't willing to engage with them any further unless they send me a letter stating that under no circumstances will I be asked to pay them anything in respect of this incident. After a few more back-and-forth I sent them packing and told them that as far as I am concerned they can claim any shortfall on their Axa policy, and that I did not expect to hear from them again.
Needles to say I had no particular benefit from this arrangement (other than not having to deal with the insurer myself), i.e. I drove-off with the loan car, then came back a couple of weeks later and collected my repaired car, and that was that.
The dealer BTW totally washed his hands of the whole thing claiming they had no affiliation whatsoever with the accident management company (which is rubbish because legally they are still liable, even if one of their employees did this as a private project, which I highly doubt).
That left a bitter taste and the lesson learnt was to never ever use an accident management company.
When someone crashed into my wife's parked car last year, I dealt directly with the other-party insurer and got everything sorted myself to my complete satisfaction