Sonoff th10 not power via socket

Hello

I had one of these running perfectly flashed with tasmota, then we had a powercut and it stopped working. So i flashed it again and no joy at all. It works via the usb with GND and VCC attached via the FTDI. SO i tried a spare I had, well blow me exactly the same problem, no power when plugged in. I have swapped all the cables, plug, fuses, etc but both refuse to work when plugged in but are fine via the FTDI.

Anyone have a clue please?

Cheers
Mark