My car was involved in an accident recently too

A plonker-type person driving a delivery truck didn't see me and drove into the passenger side on a roundabout.
Since the damage was cosmetic - rear quarter panel badly damaged, scuffed wheel and a dent on the edge of the door - I conceded to allow the car to be collected and repaired by Admirals approved garage "local to me".
It turned out to be a garage 17 miles away. I was called on the 7th November and told that the car was fully repaired. My initial thoughts of my car - parked outside in wet conditions for me to view - was that it appeared okay as the paintwork looked to be a match. Closer inspection revealed a deep scratch to the new rear quarter panel, a very poorly repaired chip near the boot lid and the fact that the rear quarter panel was mis-aligned and was some 3-4mm proud of the boot lit line. I ceased inspecting it at this point and it was agreed further work was to be carried out. I wondered about the lack of quality control at this point...
On the 13th November I was told my car was now 100% ready. A further delay was due to the fact that the original repairer hadn't noticed that the paintwork to the rear - if I recall correctly - of the replaced panel was incorrectly painted and the correct paint had to be ordered in; something no-one had noticed previously but was picked up during the panel re-alignment. The excuse offered was that the original repairer was unfamiliar with BMW's!!! I collected my car - again in less that favourable weather conditions for inspection and paid my excess and signed the release form as the three issues I had originally highlighted appeared to be fixed.
On the 15th November I returned the car on the grounds that there was overspray where the chip behind the boot lid had been repaired - quality control? - the leather seat covering was coming away beneath ther driver's seat because someone had pulled on it - presumeably in an effort to adjust the seat not realising it is electric - and because the swage line on the repaired passenger door was missing/not as pronounced between the handle and the rear quarter panel - clearly evident on the drivers door.
I was called to collect the car on the 17th November again and the seat and overspray had been dealt with but the garage challenged the swage line issue on the grounds that they claim the repair works were beneath it. I then contacted Admiral and voiced my concerns in this regard.
I have looked at the accident photographs taken by myself and they are inconclusive in that they are not focussed upon the swage line itself. I have contacted BMW UK and they are adamant that the factory mouldings are identical for all cars and it should be there and I have now inspected three other Z4's and they all have it. I then contacted BMW Sytner High Wycombe near my home and they advised that in order for my Warranty to be intact - the car is only 9 months old - Admiral need to provide evidence that the correct paint was used, the correct paint thickness was applied and only genuine BMW parts were used. In addition, I need to see the wheel alignment reading - the rear wheel was involved in the accident and I was told replaced so wheel alignment was mandatory.
I have also since noticed that the boot lid needs to be slammed shut - it no longer shuts smoothly - and that sometimes the warning light on the instrument panel remains on even when the boot lid appears to be closed.
Moving forward I am requesting that Admiral provide the information highlighted above and provide assurance that my car's warranty - balance of 3 years plus 12 years for corrosion - is unaffected by the repair works carried out by their preferred repairer rather than a BMW Bodyshop who would have ensured the Warranty remained intact. I also want Admiral to arrange that the swage line issue is resolved by means of an independant inspector - ideally someone well-versed in BMW cars. And, of course, the boot lid sorted out!
Lesson learnt: use BMW bodyshops only and use their accident management service.
I think I'll eventually end up satisfied but it is a real pain allowing the lowest bidder to have a go at the car!