I'm not sure, 5 years of news is a lot to summarise and I doubt anyone has condensed down all the juicy bits. Basically the 2010 election was a bit of a plot twist in that the right-wing conservatives pulled a surprise victory against the left-wing Labour ruling government by forming a coalition with the socially left / economically centrist liberal democrats.
The newly formed government then passed a bill which raised university tuition fees to £9000 (around 12000 euros a year) which the lib-dems had promised to veto in their manifesto and ran on the platform of opposing but ended up voting in favour of. This was the straw that broke the camels back in a long rising, extremely widespread disillusion in the political establishment. The coalition government then proceeded to heavily cut public sector spending despite massive unpopularity. However this did end up having a seemingly positive effect on the economy with rapid GDP growth and a sharp drop in unemployment.
It then turned out the lib-dems had crumbled on the tuition fee change in order to pass a referendum on changing the voting system but was strongly opposed by the conservatives with dirty tactics like this and this which ended up failing and the lib-dems were completely broken. They've since managed to pass a lot of their other policies but their popularity was completely sabotaged. Later on there was a coup by the opposition (labour) on intervention in Syria with the vote coming out against military action which was a huge shock. There were all sorts of other political upsets during this time as the main parties clashed.
In the summer there was an attempt by the Scottish parliament to secede from the UK, which failed. This however created a lot of tension against the British parliament in Scotland. All of these combined events have meant that the upcoming election is an absolute mess.
The conservatives are unpopular due to the cuts they made, but their economic policy seems to have worked so they aren't completely down and out. The main opposition have a leader who looks like this so despite offering a credible alternative are suffering in polls. Furthermore the scotland situation has led to a huge rise of popularity for the Scottish National Party which has taken a huge number of seats from Labour. Additionally a right-win EU-sceptic party called UKIP (UK-independance) are winning support amongst the politically disenfranchised right wing, while the Greens (pro-environment but kind of nuts) are scooping up the run-off from the left. This means the Conservatives and Labour are neck and neck in the polls but neither can scrape together enough seats to form a government. Even a Cons/UKIP/Lib-Dem or Labour/Lib-Dem/Green coalition doesn't get close to the required seats. The only third party capable of making a government are the SNP (Scotland) and hold the balance of power in the upcoming election. A snapshot of current polls can explain the situation nicely:
http://www.bbc.co.uk/news/politics/poll-tracker
So absolutely noone has any idea who the next government will be, or even if we will have one. There is constant political fighting from every side and no parties look close to allying. The closer it gets the more dirty tricks are being played, the more the media ramps up the rhetoric about how evil their chosen allegiance is and the less anyone has any idea of whats going on.
