After much correspondence my anti corrosion claim for the roof of my E89 has come to a head with BMW UK. They have said that "due to the convertible part being separate to the shell" it is not covered under the corrosion and their good will gesture is their final decision. They have offered to replace the roof panels at a cost of £3100 split £2400 by them and £700 by me. At the risk of losing this offer, do I take on the big boys in the small claims court.... what would you do?!