During the second day of UKIP's biggest ever Annual Conference in Doncaster, the Conservative MP Mark Reckless was welcomed to the stage by UKIP Leader Nigel Farage where he announced to rapturous applause that he was leaving the Conservative Party to join UKIP.
You can watch his speech explaining his decision and relive the moment here:
And you can read Mark Reckless' speech below:
"Today, I am leaving the Conservative Party and joining UKIP.
"These decisions are never easy. Mine certainly hasn’t been. Many have been the sleepless nights when I have talked it over with my wife and thought about the future of our children.
"But my decision is born of optimism, conviction Britain can be better, knowledge of how the Westminster parties hold us back, and belief in the fresh start UKIP offers.
"We all know the problem with British politics. People feel disconnected from Westminster.
"In fact, “disconnected” is too mild a word. People feel ignored, taken-for-granted, over-taxed, over-regulated, ripped off and lied-to.
"And they have reason to.
"MPs, with some honourable exceptions act, not as local representatives, but as agents of the political class. Too many focus, not on championing their constituents’ interests at Westminster, but on championing their parties’ interests in their constituencies.
"We’ve even evolved a special vocabulary to talk about the way MPs betray their constituents’ interests. We talk of politicians being “brave” or “mature”, “pragmatic” or “realistic”. But they’re all euphemisms for the same thing: breaking your election pledges.
"Well, I can still remember the promises I made in Rochester and Strood at the last election, and I intend to keep them.
"I promised we would cut immigration. I promised we would deal with the deficit and then bring down taxes. I promised we would localise decisions, including over housing numbers. I promised more open and accountable politics. Above all, I promised to help get Britain out of the EU.
"And shall I tell you something? I’ve found that it’s impossible to keep those promises as a Conservative. That is why I am joining UKIP.
"I haven’t reached this decision lightly. I’ve been a Conservative for as long as I remember. I have friends across that party, in Parliament and in the constituency. I hope some will remain friends.
"I don’t doubt the patriotism of Conservative volunteers and supporters. But I’m afraid that my party leadership is now part of Britain’s problem.
"Let me return to those promises I made in Rochester and Strood.
"I promised at the last election, as did every other Conservative candidate, that we would cut net immigration from the hundreds of thousands a year to just tens of thousands. The reality is that in the last year 243,000 more people came to this country than left, back up to the levels we saw under Labour.
"I’m not someone who is always and everywhere against immigration. It takes guts and energy to cross half the world in search of a better life, and I support a sensible amount of controlled, legal immigration.
"But if my constituents are asked to accept the case for some immigration, they want to feel, in return that we are in control of whom we are admitting and in what numbers. And we have no such sense today.
"The insanity of our migration rules mean that second generation Britons in my constituency have huge difficulties just to bring granny over for a wedding, let alone marry someone from abroad themselves, yet they see our borders open to unlimited numbers of EU migrants.
"Does anyone, on Left or Right, genuinely support an immigration system where we turn away the best and brightest from our Commonwealth, who have links and family here, in order to make way for unskilled workers from Southern and Eastern Europe.
"I promised to cut immigration, while treating people fairly and humanely. I cannot keep that promise as a Conservative. I can keep it as UKIP.
"I also promised that we would make government live within its means, just like the rest of us have to.
"Instead, we are adding more to the national debt in just five years than even Labour managed over 13 years.
"And two weeks ago the three Westminster parties have just committed themselves to giving every Scot £1,600 more a year indefinitely.
"I promised to restore order to our public finances. I cannot keep that promise as a Conservative. I can keep it as UKIP.
"I also promised to put my constituents’ interests first and return power from the centre to our locality.
"In particular we promised to do away with Labour’s top-down housing targets that forced us to concrete over our green fields.
"Yet, now I find that, under government pressure, our Conservative council in Medway is increasing its housing target from the annual 815 we had under Labour, to at least 1,000 every year.
"Despite the promised EU referendum, it is assumed that current rates of open door EU immigration will continue for at least twenty years.
"In my constituency that means they are giving permission to build 5,000 houses in a bird sanctuary on the Hoo Peninsula, despite it having the highest level of environmental protection as a Site of Special Scientific Interest. If that goes ahead, where will it stop?
"I promised to protect our rural Hoo Peninsula. I cannot keep that promise as a Conservative. I can keep it as UKIP.
"I also promised to help make government more open and accountable, so MPs would answer outwards to their constituents, not inwards to their Whips.
"David Cameron and his government promised to cut the number of MPs, give Parliament its own timetable, offer free votes in bill committees, have 200 postal open primaries, and bring in Recall for voters to sack MPs.
"Yet, not one of those promised reforms has happened.
"I promised political reform. I cannot keep that promise as a Conservative. I can keep it as UKIP.
"And, of course, I promised to give people a vote on leaving the EU. When I voted that way in the Commons, along with 110 other MPs from various parties, we had three-line Whips against us from all three party leaderships.
"Since then, David Cameron has promised a referendum. But I’m afraid I’ve reluctantly reached the view that he is doing so purely as a device. He has already preordained his intended outcome, namely continued membership of the EU on something very close to the current terms. Everything else is for show.
"What the prime minister has in mind – it’s not even a secret at Westminster – is modelled on what Harold Wilson did in 1975, a bogus renegotiation followed by a loaded referendum.
"David Cameron, and all levels of government backed with taxpayers’ cash, would pretend the terms of membership were radically reformed, when in reality little or nothing would change.
"A referendum should be a solemn and binding moment. A reminder to politicians that we work for the rest of the country. It shouldn’t be a party-political trick, a way to paper over cracks, or a way to buy yourself time.
"I believe the question now is, not if we get a referendum, but when and on what terms. So, why should we accept terms loaded against us?
"In this hall we want a straight referendum. An honest question. In or Out. No fudge, no conjuring trick, no sleight of hand, no fake renegotiation, no pretended new terms. Just a clear choice between EU membership and an independent Britain, trading with Europe but governing ourselves.
"Every vote for UKIP, every MP for UKIP, means a better chance of getting that straight, fair referendum. If you vote UKIP, you get UKIP.
"I promised a straight In/Out Referendum. I can’t keep that promise as a Conservative. I can keep it as UKIP.
"And when we get that referendum, I want us to make the case for British independence in warm, optimistic language. We are not backward-looking or gloomy, still less xenophobic. The only nostalgia I see is the nostalgia of those Euro-enthusiasts who cling to their 1950s vision of a United States of Europe.
"In almost every other field of politics, we have moved on. We no longer believe, as we did in the 1950s, that big conglomerates are the future, that the expansion of government is benign, or that economies needed to be planned.
"But the EU remains a child of its time, wedded to its five-year plans, its unelected commissioners, its common workplace entitlements, its fixed prices, its corporatism, its lobbying cartels.
"That is why Europe is the world’s only declining continent.
"It’s therefore not nostalgia that makes us Eurosceptics. It’s optimism. We understand how much greater Britain could be if we raised our eyes to wider horizons.
"All of you in the hall already know this. But I want our friends watching through the media to understand it, too. UKIP is a positive party with a positive vision. We believe in a global Britain, prosperous, independent and free. We believe in a Britain of opportunity we would be proud to leave our children.
"Before I conclude, I want to invite you to come to my constituency. And I may need you even more than Douglas because Rochester and Strood is not Clacton.
"Matthew Goodwin, the leading academic to study UKIP, says Rochester and Strood is not even in the top 100 Conservative constituencies vulnerable to UKIP.
"I am proud to represent many ambitious professionals, aspirational families and young commuters. And by the way, if any of you are watching now, I hope you will be voting for me.
"In Rochester we have a castle and a cathedral. We’ve a lovely high street full of independent shops. There are French patisseries and Italian delicatessens. We are less than an hour from London and just two hours from France.
"Matthew Parris would love it.
"But, just as Douglas Carswell answers to his constituents in Clacton, I answer to the constituents I serve in Rochester and Strood.
"They are my boss. And, if I want to represent them under different colours, I hope in a party closer to their values, then I should ask their permission.
"So, I will resign my seat in Parliament, trigger a by-election and, your National Executive allowing, stand for UKIP.
"And I need you to join my campaign because, if we can win in Rochester and Strood, as well as Clacton, and perhaps here in South Yorkshire then we will show that UKIP can break through across the country. We will show once and for all that if you vote UKIP, you get UKIP.
"A UKIP which can do for politics, what modernity has done for society. A UKIP which is about hope and optimism. A UKIP which can safeguard our children’s future. A UKIP which believes we are more than a star on somebody else’s flag."