Don't think there's much to be done. VM won't do anything as it's definitely outsourced, all the Telewest servers were shut down years ago. Only answer is to hope it sorts itself out or go with another provider, unless it's some sort of giant conspiracy to bork Usenet

Although strange it's across multiple providers.....
---------- Post added at 19:08 ---------- Previous post was at 18:57 ----------
Bit of digging shows it's outsourced to Highwinds, a Dutch company, probably the same one as Demon outsourced to, can only ask VM to speak to Highwinds and investigate any changes...