We've had this problem over the weekend. Just got a new Smart TV so was worried it was that, but everything else (non Virgin) is absolutely fine. Picture jumping all over the place and talking completely out of sync with mouths moving! Watching Strictly was almost un-watchable! We have a TIVO box.
Thank you - I will try all that shortly and come back if it's still a problem. Although having read through several similar threads, does appear there are a lot of people with the same issue at the moment! We put it down to everyone being at home on a Saturday night instead of out!