My take on this - if we go this route (Mansion Tax, raise top rate to 50%, cut tuition fees .......) we're going to end up like France. Having just come back from a few years working there, I can report that their economy is an absolute disaster. Their government borrowing is incredible (even higher per capita than ours) and they're going to get found out sooner or later. The only thing that keeps them going is that the public continue to buy French, something we can't do.
I don't like any of the parties, I think there should be a tax on bankers (and bonkers) bonuses with the money going directly to the NHS (not getting swallowed up in back office "admin"), but I think if we go too far left and "soak the rich" all that will happen is that they'll leave in droves or find new ways of getting around paying taxes.
My radical idea would be to raise the threshold for paying income tax to around £20,000 then tax everyone above that at
30% flat rate - closing ALL the tax loopholes. That would make the "rich" pay the same percentage as everyone else and put all the tax specialists out of a job. Stop people buying houses through corporations to avoid stamp duty and make everyone pay their way .......... It won't happen, but it's a nice thought!!