No sources that put people in danger need be revealed, but some hard evidence about the nerve agent and the derivatives from its breakdown, that have been claimed to possess fingerprints as to their precise origin, wouldn't harm anyone. Let's face it. That evidence isn't there. The evidence we've been given is all circumstantial. Stuff like, oh, typical Russian behaviour. Russia has form. They refused to kowtow to a weak prime minister's demand for answers. But the nerve agent has been around for decades, there's some in Porton Down and there's some in a lab in America somewhere. The man who invented the stuff has lived in America for over 20 years. Rogues and gangsters have always managed to get their hands on stuff they shouldn't have and they always will. I think it's more than possible that the Russian state is directly responsible for this. But that wouldn't get you convicted beyond reasonable doubt in a court and the only thing I can think of is that our weak leaders actually want a cold war. Didn't do Thatcher and Reagan any harm. Reread 1984. Nothing keeps you strong with your electorate like a foreign enemy, especially when you are shaky at home.