Here are the main points from Nigel Farage's speech.
• Farage said that Ukip's priority now was to ensure that Britain had a full in/out referendum on membership of the EU, not just a referendum on Britain having a looser relationship with the EU. None of the main political parties is yet fully committed to an EU referendum, but David Cameron has strongly signalled that the Tories would call one after the next election and it is widely assumed that the plans to renegotiate the EU treaties in the light of the Eurozone crisis will eventually lead to British voters being given a say on any new arrangements. Farage said a referendum was inevitable. But it was not the referendum Ukip wanted, he said.
"I'm very, very worried about what I see. From David Owen to Liam Fox, what we're now seeing is the political class uniting around a position. The position is that we don't want to be part of this new federal superstate, but we do want to be part of the customs union, and we do want to be part of the single market and that there's nothing to fear from all those things because we won't be trapped inside a political union with Europe.
Well, I've decided to take that on and I've launched a booklet called A Referendum Stitch-up. Because what is happening is remarkably similar to what happened back in 1975 … when you were told it was a common market. They are trying to do the same thing again.
I think what Cameron will do, next week or the week after, is to say we can have a referendum on whether we join that full federal union, or whether we stay with the single market and a customs union. And that is a battle for us. We have got to go out there as a party and make the arguments. We don't want to be stuck inside a customs union that prevents us from making our own trade deals with the rest of the world, the growing parts of the world ... We in Ukip demand that this country is given a full, free and fair choice in a referendum, so that we can decide who governs Britain."
• He played down the prospects of Ukip entering into some form of electoral pact with the Conservatives before the general election. Ukip was an independent party, with its own agenda and its own candidates at elections, he said.
"But if an opportunity came which meant we could get this country closer to walking through a door marked 'UK independence,' if we had the opportunity to do something that was in our national interest, we would be silly not to even consider it."
Farage said that talk of an electoral pact was coming from the Conservatives and that he personally would do nothing to "sell this party short".
"The only way we would even consider a negotiation of any kind at all would be if first an absolute promise was made to give this country a full, free and fair referendum so that we could decide whether we remain members of the EU or not. That would have to be on the table before we even considered any proposal.
And we would possibly have a problem even then. Some of you may have noticed that there are one or two people in politics who make promises and then break them. So I don't think a cast-iron guarantee would satisfy Ukip. At the minimum, it would have to be written in blood."
What does "written in blood" actually mean? The only plausible interpretation must be "written in statute" - ie, the government would have to pass legislation before the 2015 election for a referendum afterwards. The chances of that are minuscule.
• He said Ukip's aim was to win the European elections in 2014.
"By then we may well have the bones of a new treaty. We will have a political class doing their best to ignore the issue, doing their best to give us a fudged, stitched-up referendum. I think we will be in the driving seat for those European elections. I believe it must be Ukip's aim and goal to win those European elections in 2014, to cause an earthquake in British politics and to change the future of this country forever."
