Well, feel really let down by Audi:
No phone call today, so me and the Mrs called in to see them at 4pm.
Turns out the new compressor is working fine, the car maintains it's level, and has stood overnight and is still level.
BUT
The diagnostic still throws an error 'cos the accumulator never gets up to pressure. They won't release the car in that state, as, if there's still a leak the pump could burn itself out(again?).
They're ordering a replacement accumulator, and they're on back order, 7-10 days
Can't give any estimate on completion, have no courtesy car with a tow bar.
Spoke to the guy now working on it, and no leaks have been actually found yet. Seems like they're just following the flow-chart of fault finding, replacing whole parts as they go.
It's back in the workshop in the morning, for one last look with a fresh pair f eyes, but they didn't sound hopeful.
The annoying thing is, i only authorized the repair because i was guaranteed it would be ready for tomorrow. And that was the basis of the whole saga.
Meanwhile my ferry crossing is Saturday morning at Portsmouth.
Now to find a car to borrow.....