The part numbers are "8" seal 077115441, Pipe 077117411A, Pipe seals 077121437.

Brilliant. Thanks very much! :)

The part number I had was 077 198 405, which a think is for a kit, but it doesn't seem to be available in the UK.

Do you know if the parts you listed are readily available in the UK, either from Audi themselves, or the likes of TPS, etc? Otherwise, I'll make some enquiries.

Yes you can get these from any Audi dealer or TPS centre. Next day order usually.

Superb. thanks :)