You seem to know what you want, so go for it. It's never going to be difficult to do, just a bit of a pain in the arse at points. As you said, very little fabrication is required so most of it will be bolt off, bolt on to red one with a donor. There are gentlemen on here or club gti who are more than happy to advise you get stuck, so good luck! 
Appreciate the support, thank you.
PD 150 ftw! 
My budget won't stretch that far I'm afraid!
I see little point in an engine swap but your choice.
I would absolutely agree with you most of the time, and appreciate your perspective Wayne since you seem to know your stuff! I could insert the usual cliché about how 'it's my car, i'll do what i want'
spiel, but that's not what this is about. Whichever way we look at it, a TDI conversion would be advantageous, particularly with the recent budget sh!te that the government is implementing, since we're apparently gonna see £1.50/litre on fuel before the year is out. Alot of people, including me, are going to need every mpg they can get, arguably already do.
Since this is my only car, and will be driven daily for many more years (with any luck), the extra power and the practical experience of carrying out the conversion are, to me, invaluable.
And god knows, these engines will probably still be functional long after the last drop of oil has been harvested.
Thanks again everyone.
