The only problem that springs to mind is if the BCU is subject to water ingress due to blocked plenum drains. Not aware of any 'usual' problems.
You need to return your questionnaire to Tim in order to get full access to the site, you will probably find the answer to your problem.
What is the VIN (last three digits) of your car and whereabouts are you located?
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.