Arrrgggghhhhh!!!!!!

B***ocks!!!
Bought a new HDMI cable and still got the flashing
Still got the same problem even after a CS lady person type thing sent some "Magical Boost" to my STB and after performing a hard reset for her too!!! So now I gotta have a Tech come out to me which is a lucky dip as to whether I get a bloke who knows what he's doing or a doofus who don't.
The last mug - er sorry, Tech I had said my signal was over modulating

and then proceeded to stick in about 2 ft of atenuators (filters)

out the back of my SciAt Cable Modem.
AND on top of all that I'm now shy of 45 quid for the HDMI cable