Oh well..................
Ended up paying £1370 altogether, inc all seals, and a £70 oil pipe(06F145778G). When I asked for my old turbo back, they then told me it was an exchange turbo so I couldnt have it back. I had a look at it and there was some oil coming out of it, and they was a bit of play in the shaft aswell.
I did a 20 mile trip, and still getting random plumes of blue smoke, and tailgate being covered in black dots again. So headed back to the dealers and they said everything was caked in oil, and I need to do at least 200 miles before it clears up
I'll give them the benefit of the doubt, but I find it highly unlikely that it will, I seem to have a distinct feeling I've just wasted £1370 on a second hand turbo that I didnt even need
On another note, I test drove a leon cupra r today, very nice, even the standard exhaust sounds better than my milltek, unfortunately was only offered £9500 for my heap of cr@p so I guess I wont be buying it