Thanks for advice people, I think my near future plans are this then:
1.Turning the boost down a bit!
2.Fitting my spare standard turbo for the time being
3.Get my existing turbo rebuilt/upgraded

That should keep things in one piece while I find out exactly what it's had done to it!

I did'nt realise you could upgrade the internals on a standard turbo, Where you gettin that done series1ajc?