Also I read in the thread that you replaced the oil separator: I have a hard time finding it on the internet. can it be found easily in England?
Greetings from Italy
Have you tried searching by part number? The part number is under item 19 on this data page from 7zap, a useful resource.
cylinder block with pistons<br/>oil sump Audi A2 (A2) 2003 year Audi EUROPA 103020 spare parts
A search by part number will produce lots of vendors such as this, but others may be nearer home.
036103464AC Separator: parts group R08 weight 0.97 kg oil separator
This is for new but there is always ebay for a used part.