Yep, it's the case for many many people for some reason. Not just for Sky users i don't think.
Sky & VM customers, yes.
DSL....fine on LAN and WAN
So its a YT issue then?
It's been rubbish on my Sky connection for a couple of weeks.
Doesn't appear to be a capacity issue - everything else runs at maximum speeds. It's just YouTube. 480p is OK, anything higher keeps stopping to buffer.