Hi, sorry couldn't respond sooner, but have been under the knife! Having got a few weeks of convalescing ahead the 'blinking' would have driven me nuts but, touching wood, I think I cleared it.
My hdd recorder had picked up welsh stations and tv was tuned to English channels, retuned hdd as possibly causing conflict with tv.
Factory setting, reset the tv,
Set to text/ graphics,
Accepted upgrade when shown on screen, all seems fine.
Thanks for the replies