Hi, thanks for the info Ian, much appreciated.
I did check on eTIS but nothing related to this fault. As an independant garage it seems we do not have access to the TSB's and I raised this with them and they said that only dealers have access, fortunately I get on well with local dealer and they fax me the relevant TSB if I can supply the number.
I will try to persuade customer to have updates.
Update on fault; I left the car locked overnight and checked the drain this morning, it was 80mA.
I seem to have an intermittent drain because the drain the previous day was 10mA or less.
Traced it to hands free phone kit which I have now disconnected.

Thanks again, Martin.