motor vehicle assessor in Berkshire area

[baller11]

Hi all,
Just wondering if anyone knows of a good, reasonable assessor who can come out and write a report on the damage some kind lady caused to my mini (classic one) for my insurance company. They have already sent an assessor but im not happy with his decision....fillering some bits that i want replaced! The only way i can get my insurance company to replace rather than repair is if a independant assessor says so!

Any help would be much appreciated

Dave