I use channel 13, next door is on 11 and there are a few 6s around.
One (english) virgin support guy suggested 13, but then you have to fight any (indian) support guy who wants to follow the rules and get you a ‘virgin supported’ channel, something like 11 which clashes with next door but this matters little to the (indian) support guy.
I have moved to using a DLink power adapter to my main work area, and get speeds of 50Mbish and better pings.
When I last had a problem (the power one) I reported that it was nothing to do with the wireless as one laptop demonstrating the problem, which is the one the virgin support guy was remoted on to, was hardwired to the superhub, and the other laptop was using the DLink powerline connection. Both laptops had their wireless receivers disabled.
That didn’t stop the (indian) support guy from spending 50 minutes switching the wireless channel around on the superhub and then running speedtest repeatedly and declaring that the problem was that I was on channel 13. He didn’t seem to grasp the non-deterministic nature of speedtest.
Eventually he handed me over to the (english) support guy who then diagnosed the problem quickly and arranged for an engineer.
Lots of good proactive indian engineers around, it is just a shame that virgin don’t seem to employ many of them…