Ah. You don't need to see the actual cable to make your decision. The Telegraph wins again. Yay, "we want to believe, therefore we WILL believe".
Your faith in your government is touching, if not slightly scary. So what you're saying is that for me to reach an opinion is that I actually have to lay eyes on a caveated, sensitive government document?
And it's not what I want to believe, speaking as one of the more pro-American voices on this forum, which is often full of knee-jerk anti-Americans of the most tiresome sort. It's what I'm inclined to believe based on the available evidence, which is that your country is no longer particularly concerned about mine and that the current Whitehouse would happily dump a seventy-year alliance for short-term political advantage in a tough mid-term year.
So, yes, I bloody well think your government would intelligence share with the Russians if it was in their perceived interests.