Well, nothing as such.
The garage who have been responsible for all this (same place I bought the car from) are doing all the work FOC as it was, in my opinion, their fault that the turbo blew.
I'm getting a new EGR valve, new middle and back exhaust and a new turbo.
Hopefully I will have it back by the end of next week so I can then report on whether the car is actually fixed, whether there was any engine damage when the oil was dumped out of the exhaust and whether I want to keep it, knowing the problems that I have had with it.