Hi,
Its fixed now, the problem was due to sticking turbo vanes, it was sticking in the open position, and somtimes in the closed position.
The turbo I bought was a reconditioned unit, It should have been fully refurbed including cleaning, new cartridge, balanced, calibrated and flow tested.
After all the issues I've been having I decided a fresh set of eyes were needed so I took the car to another specialist who diagnosed the issue. They replaced the turbo for thier own reconditioned unit and thankfully the turbo works perfect now.
I cant imagine how a reconditioned unit would have its vanes stuck within a day of driving, I honestly believe Ive been fobbed off by the first turbo specialist, he musnt have cleaned the vanes out. I cant understand people like them, I paid for a service, a good price, left the car with them for a total combined period of 6 weeks. I explained I would consider paying extra for diagnosing time yet they still fobbed me off.
The second specialist diagnosed it within 6 hours and had the job done within 2 days, and I paid £200 less.