Choppy on demand video

Hi, I've got a real problem with on demand video. It has gradually got worse over the past few weeks and is now unwatchable.  Downloads are OK, as are normal freeview channels, but anything from on-demand just waits 10 seconds or more between frames with/without audio.  I've tested broadband (3.85mbps download) and rebooted the router, the ethernet mains connector and the BT Vision box several times and it has no effect (if anything it's worse).  I've just about had enough... any ideas?  I can't even watch the help videos!!

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