Welcome to the club. Spring pans are not replaceable, the whole suspension unit will have to be replaced, they are available from Rimmer Bros for a price but if you become a full member of the club Tim is arranging a bulk buy at the moment for a much reduced price.
Intermittent misfire could be due to COP's but it would be a good idea to get a code reader and often swapping over the COP's can identify that anyway.
Couple of weeks with a de-humidifier should sort out your damp problems, check for sunroof drain leaks (if fitted!).
What are the last three digits of your VIN?
Nich.
Nicholas John Peter Tinker - # 484
Manufactured on Tuesday 27th April 2004 @ 12.17.47.
Commission Number: 24468.
Brochure Model: M3 Tourer 4.6 V8 260PS.
Specification Code: L01B.
CICode: D1511.
Trim Level: TL8.9 (M3).
65th ZT-T 260SE to be made out of 115.
11th ZT-T 260 SE in Pearl Black (PBT) out of 23 produced. Manufactured in the UK by MG Rover Group Ltd.