Although the RWNJ tendency over here is loud, it's also not all that popular.
True, in the affluent South East corner (i.e. London and the M25 sphere, reaching out to Surrey and Kent) it's particularly noticeable, but the other 45(ish) million people don't live there.
There's a significant difference between what you see on the web and what you see at the ballot box. The only reason Labour lost the last election was because they fucked things up spectacularly and, in particular, Gordon Brown was revealed to be an utterly incompetent megalomaniac, clinging onto power long past the point at which he should have conceded.
His handing of the poisoned chalice to Alistair Darling, who got the unenviable job of cleaning up Brown's fuckups (long story short: Brown borrowed and spent like a mofo (not necessarily bad), but didn't tip it into as much capital investment as he should (definitely bad), flogged the gold reserves off in a monumentally stupid way, and then deregulated the banks and looked on aghast as the banks did what banks do when you don't regulate the shit out of them) was also particularly disgraceful.
The Cameron/Clegg ConLib coalition is not particularly compelling. Their best asset - Vince Cable - oscillates between being laser-accurate and correct, and saying really fucking stupid things. Osborne is out of his depth. Cameron has a significant gravitas shortfall. Clegg will say anything to stay elected. And the cabinet is a bunch of nobodies.
We will elect a Labour government in 2015, because reality tends to the liberal, and British people, despite being a pack of arses quite a lot of the time, are fundamentally in tune with this. We have this gestalt of "fairness" (an ill-defined concept, but we know it when we see it and vice versa) and backing the underdog, which I think counterbalances nicely with our willingness to be selfish wankers.