Bore the head out to 2 litres - I'd love to see that one !!

(only teasing)
It's the bottom end that needs the modification to increase capacity ... and you'd be suprised how much money would need to do the things listed below. Certainly not 4 grand !
1. Chip say ?300 top wack although that's well over the odds
2. Exhaust ?300
3. Cam kit ?300
4. Head work ?200
5. Bottom end (Audi 2 litre swap) ?100
6. Panel filter ?30
That's only ?1250 for the parts new, ebay can help cut the costs again on things like exhausts - bit of DIY and auxiliaries for fitting etc; you'll only need ?1500ish !