I've had several calls this morning from people complaining about poor TV reception last night (Tuesday 27th September) I also witnessed the breakup myself on my own TV.
There is a chance that this problem is going to be short lived as I suspect that it just could be related to the current High Atmospheric Pressure which is centred over Europe.
Although the barometer reading last night would suggest otherwise as normally UHF TV transmissions from Ledbury are only affected when the pressure is greater than 135 hPa, the pressure reading again this morning is steady at around 1023 hPa.
Re-tuning a TV during periods of poor reception or loss of picture will usually only delete the TVs memory of frequencies / channels which were originally saved from the transmitter that your TV Aerial is pointing at, creating a bigger problem, often meaning you will be without TV pictures for much, much longer than people who didn't re-tune their TV.
With the exception of an on screen message suggesting a re-tune is necessary (For an example see my news item below, dated 22 August) or advise from someone like myself or TV retail shop etc, a willy-nilly re-tune of a TV in the hope that it will restore the channels should be avoided and is almost always counter productive.
The on-screen message "Weak or no signal" which sometimes appears on a TV screen while experiencing poor reception is NOT an invitation to re-tune the TV!
TV tuning and poor reception apart, there is at least one good thing about High Pressure in that if you are out and about you sometimes get to see great sunsets like the one in my image above, I took this photo while working on a roof last night in Shernal Green near Droitwich.