BAD NEWS... they have done sweet FA with the power button!! I am so angry! I called them to discuss the issue and they had all the details from Sony passed to them so there was no excuse. There is no way they could have checked it against a working unit, so I have just wasted 10 days.
Worse still I had to contact Sony again to get a new repair number to send it back to them, its a blooming joke! Sony has lost any future custom from me on the handset market!
So now tomorrow the phone will be returned for SBE Ltd (who are Sony Xperia's UK repair centre) to do what should have been done the first time, yet again I am without my "flagship" device!!