So I've had a quote from an engine rebuilder that Steve recommended. Very knowledgeable company and to rebuild my engine will cost around £5,220. That includes:
£3,400 for all new internals. Including new Cambelt and water pump. Block and heads the same.
£1200 new injectors (my choice) as mine are 21 years old.
£590 for a genuine Audi turbo.
Total so far is £5,220
I've asked for additional costs of changing thermostat while they're at it. But not had a price for this yet.
I'm going to ask them to quote for replacement clutch and duel mass flywheel.
If I'm doing it I may as well go the whole hog?!