Thanks all
Left it into dealer today. Picked it up to be told that they hadn't come across it before but on checking with VW UK that they acknowledged its a software problem and should have a "fix" in a few days.
So another trip to dealer next week, but at least it's been logged.
Hi,
I picked up my gti pp dsg today, have got the standard nav and dynaudio, after I got home and went back to the car to sort out radio stations etc, turned it on and no screen on the entire screen, turned it off and left it 5 mins and turned it back on and all was good. When the dealer calls to check how things are, I will mention it and see if it is a known issue.
As an aside, the night blue looks stunning on a 3 door and dsg is brilliant!