Being a politician is hard, while you are looking from afar (ie. not running the government), you can make random promises to win the hearts of voters. However, once you are in power, the crippling debt faced by the country means that its either the politicians continue through their election promises and force Britain into a bankruptcy, or try to save it by going back on your promises. Of course one might argue that the politicians should not be making stupid promises first, but in this age where media holds so much power, they have little if any choice other than to lie a little to win more voters.
Also, increasing the tax for the rich will not work out as well as planned, because, well, being rich gives you more options to avoid them. The higher the taxes, the more incentive for the rich to avoid taxes. Hence, increasing the taxes for the rich will bring about less revenue, which is counterproductive. So, the only way to get more money out of taxes is through taxing the already overtaxed middle class since that taxing the working class will be seen as cruel.
I believe that the poor will get poorer, the rich will get richer because of the multiplying effect of wealth. If you have some money stored somewhere (house, etc.) then you can make the money work for you, coupled with the fact that you are earning, you will be making much more money than the "poor". The poor will have to dig their way out, while the rich will just cruise on their wealth.
The world is a shitty place as of now, and it will only get shittier.