Had the MAP sensor replaced yesterday. A local garage did it for me in 20 minutes, minimum labour charge of an hour of course, including the test run (I wish I'd done it myself now). Hey presto..turbo's back on line, performance is restored, Motor Control System Failure light has gone and even the puffs of black smoke out the back when accelerating hard don't seem to be there.
Time will tell if the MCSF warning will rear it's head over the next few weeks but I have tried to simulate the conditions when it would normally come on and it remains eerily quiet...well here's hoping.
Now, on to the list of other jobs I've got to and a remortgage!