Come off it. You know full well that in 1990, a more than 10 percentage point lead translated into a sizeable majority for Labour. You got that wrong.
I'm reading the website you recommended to me, btw. I'm not just making this stuff up.
Instead of parroting butchersapron's class bullshit insults, you might want to think why I'm pulling you up on this. I'm not claiming to be an expert. I am merely seeing flaws in the information that is presented to me. And when I investigate, I find that even that information isn't actually right.
The swings in fortune over the course of a parliament can be huge, as the graph from the 87-92 parliament shows. Labour has a relatively narrow lead at the moment, one that translates into a decent majority due to the demographics of constituencies, but one that is in no way historically unprecedented for an opposition party that goes on to lose the election. It can change very quickly, and has changed very quickly in the past. Of course there are complicating factors and the past is an imperfect guide to the future. I would never deny that. But that is simply another reason not to draw any firm conclusions from the current state of polling. There is nothing there that says Cameron cannot win the next election. Nothing at all.