Yes sorted thanks, it is part of 4.4 update. (I just can't get my head round the way Sony do it... sim free last, after the carriers) It was a Vodafone phone that it 'wasn't working on' but I didn't know that at the time.
I didn't get the 4.4 over air either - is that another Sony only thing? HTC was always over air and Sim Free first.
I got my update over the air, all I needed to do was refresh update centre .
"All I Ever Needed Was A Little Piece of Hope" - World of Fantasy (Helloween)
Sent from my monstrous Xperia Z1