Just to finalise this thread - I decided to go for a new compressor rather than the bagpipeandy kit. Bought the new compressor from aerosus as per the link in my original post - £289 + shipping. Was fitted by my local indy yesterday with just 3 hours labour. They tell me that the new compressor was identical to the original unit and just bolted straight on -with all necessary fittings and a new relay included.
The old pump had obviously been tired for a long while - the car has never adjusted levels this quickly in my ownership (a little over 3 years). With that plus other work I've had done recently (cambelt, control arms + a few other bits) she's driving like a new car again. Not too shabby for a 14 year-old car. Well pleased.
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Current: 2003 A8 D3 3.7 Quattro
Gone but not forgotten: 1996 A8 D2 4.2 Quattro
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