The snag is that most people using the forum will either be using a BT hub or a third party NON ISP router. Very few will be using a Virgin Hub. The interference you describe is something I have not come across before. If changing the wireless channel doesn't fix the issue then a good router is likely the only option. ISP supplied kit is hardly 'state of the art' equipment. It's designed for the masses who have limited expectations of functionality.
I get the feeling that if it was Radar interference there would be a lot more complaints of a similar nature on the forum. Got to be a lot of BT customers around Portsmouth. I'm not saying you are wrong it just seems unlikely given the lack of similar issues.
Emailed a friend who stays in Rosyth not far from the dockyard. He's never heard of similar issues locally.
Unless BT are funding this site, which I doubt, then there is no legal, contractual or moral reason why everyone should not use it. The problem in this instance will have a common solution to any radio communications.
I doubt there will be a common solution, it will probably entail changes to device specific settings.
There is no reason you can't post but its a bit like posting on an Ford forum about a problem with a Vauxhall, unlikely to get meaningful answers.