Here is a reply to Telegraph's post. Got quotes back for the various jobs that need doing and none of them a surprise except for the inlet manifold. Oh my... 750.00 quid, based on the part and 5 hours labour.
So, nothing I am going to be able to afford until we get over the Christmas festivities, and have an opportunity to catch our breath financially. The question is how much of a danger is this, and how urgently does it need to be attended to? I don't know how the car drove before this problem, but it seems to be OK now other than a slightly unstable idle. Not hunting, just randomly unstable.
Power delivery much smoother after the service, and EGR valve clean, and it should be better again after the turbo has been stripped and cleaned along with all the associated pipework.
Bottom line question is how soon do I need to get this fixed, and what do I risk happening if it's not fixed?