AlredyVCabledUp wrote:I thought only Satellite Signals were meant to be able to freeze up and pixelate
Good heavens, no! 
The signal levels to a Virgin Media set-top box need to be properly balanced. If they're too low/high or there's noise on the line, you will get pixelation.
playtimekev, you'll need to speak to the faults team about this so they can get an engineer out. Ring 150 from your landline or 0345 454 1111 from any other phone.