I am not a particularly political person, but I decided to go along just for the sheer hell of it. I was there with about a dozen students from my college, ten from Tit Hall and a few from King's. It wasn’t that violent at first, there were a lot of people, but it was a slow start-up giving people time to fester. There was a lot of anti-Cambridge sentiment by some students at other unis, who told us to “fuck off back to Whitehall, you don’t belong here.”  People were chanting - the anticipation was building.

As we approached Millbank, a row of socialists holding two banners stopped the crowd. People went round shouting to the crowd, pointing out to us that this was Conservative Headquarters. People started stamping and shouting. The reception of the building was full of suits and receptionists looking out at us through the glass in a kind of bemused way. People from the office blocks overhead were looking down as well.

Then a bunch of students in balaclavas and hoods ripped signs off their wooden posts and started smacking the glass with them.  Someone broke through the glass and people were banging at the doors. A bunch of security guards just stood there watching us, but there were no police there at that point. A couple of NUS Stewards tried to disperse the crowd, telling people that the march was over and that they should move on to the after-party, but they were drowned out by the crowd and nobody was listening.

Then, following a swooping arm action from the front man, everyone stormed the building. The security guards had evacuated the reception area and it was empty. I sort of got dragged in with the crowd. Soon there were around 300 people packed in to the foyer. They were screaming, jumping on the seats. We occupied the foyer for about an hour, chanting and shouting.  Some people were smashing up the TVs and banging on the lift doors.

After a while, we noticed that some policemen had arrived, but there were only four of them. At that point I left with some of the others. The police didn’t stop us, they were more concerned with trying to stop people coming in.

As we came out, there was a lot of smoke. People were saying that there was tear gas being let off, but actually it was the smoke from flares people were letting off. Outside the building, some people were burning effigies of Cameron and Clegg.

After a while we moved on and came across a dubstep crew and around 2,000 people all gathered around a speaker system, dancing and raving. When the beat dropped we all charged forward, jumping over cars, along the road towards the riot police.