Still, I guess it'll come down to Tory voters and upper middle class votes going towards UKIP with working class and lower middle class votes going towards the BNP.
I think the term "middle class" is wholly outdated. I appreciate your distinction between upper and lower middle class.
I ate in a five star restaurant a couple of weeks ago and felt completely untrained for the experience. You are in above your head when the waiters sneer at the Oxbridge graduates at your table, despite their discussion of a forthcoming skiing excursion. I'd call them upper middle, anti-establishment voters, potentially UKIP, although I've tried to steer one away from the Greens. Proving that cultural training is a big part of acceptance into the elite, I got a discrete tap on the head from the waiter - I don't think it was an accident - for impulsively putting my hand over my glass when I wanted to decline wine! Fortunately I did not have to demonstrate my eco-credentials. I also for a split-second wondered when the vegetable dish would be coming when I was delivered the perfectly manicured main. Give-away lower middle class, that. At least I now know what the uniform of the upper class is: cotton trousers or jeans (new rich), a shirt (preferably striped) and a light, logo-less jersey, worn either around the neck, like the French, around the waist or over the shirt. That means you eat in five star restaurants a lot and you only really dress up when you throw a domestic for the 3rd Earl of Whatsitshire.
Trouble is that Thatch was a "once in a century" storm. And now the Tory gene pool it so shallow that you do not even need to roll up your trousers to paddle in it. There is no immediate prospect of a replacement.
One reason Thatcher could rise was because she was a woman, because the toffs could use her sex as a battering-ram against their rivals - on the basis that if a woman can understand such a thing as monetarism you must be a complete fool not too! Another reason was the leadership dearth amongst the men of her age-group. Most of Thatch's main rivals were, by the mid 1970s, dead, unknowns, killed off between 1940-45.