Why can't I upload binaries to Android Sony Xperia Z?
After a lot of messing around I think I've nailed it. It was an application called "Sony Smart Connect". Like most things that contain the oxymoronic phrase "Sony Smart" is anything but smart. Instantly everything went back to working and I can now get on with coding until the next update stops me for a month...

I hope this is of help to someone in the future.

Dom