There are two problems causing the picture quality issues.
First, channels like BBC News 24 are compressed too much, and look crap. Posher channels like BBC1 and C4 don't compress so much, and the picture quality is better. Incidentally, the same compressed picture is used on all digital platforms: Freeview, cable and Sky, so no platform is better than any other in that respect.
The other issue is the STB. Most Virgin ones, especially the old Pace ones, are crap with very poor picture quality. If you have a Pace box, complain and ask for a newer Samsung one.
Blotchy and full of snow all over the screen. Colours look as though they are limited as there are clear gradients all over the screen.
Its awful and I wish I had kept my old telly and old Virgin box.
I have v+ box and SD PQ on my lcd tv is superb. Sometimes I have to remind myself I'm not watching an HD picture. Too many times the poor old tv is blamed for poor pq when often, as mentioned by other posters, the problem lies with the programme source.
I Have a V+ box connected to a 37" LCD via HDMI, sd picture quality is pretty damn good, hd pic quality is superb, but on occasion I do get what looks like 'snow' on my hd pic, anyone know what this could be? I did invest in a good HDMI cable but I've been told that shouldnt matter as its a digital signal and not an analogue one