Tonight when I was going to sleep I plugged the phone in the charger when the screen was off and the phone never reacted at all.
So I opened it up and there was no sign of the phone charging.
I went through your steps above and after first turning the USB Accessory switch off and then rebooting the phone (followed your steps word by word) it worked!
Plugged in the phone with the screen off and it started charging.
Don't know if this is a permanent fix but it sure would be nice.
Thanks a lot for your help