Sorted.....!
It's Sharp made by Hisense, UMC clone. Sharp UK hadn't heard of this model so I tried Hisense, they sent me the firmware which made it a telly again.
Remedy, download the firmware onto a USB stick, with set unplugged insert USB stick and plug in, this will take about 7 minutes during which time the update progress is shown, the set will switch off you MUST wait until the led flashes rapidly before unplugging the power and then removing the USB stick.
This is what confused me-:
The instructions says power up and then wait about 15 to 20 minutes while it updates, what happened in my case was the set powered up I got the initialising circle and then kept switching colours as if in 'burn-in' mode, like a fool I waited and tried again - all I had to do was to press the power button while plugging in.
Dave