British Prime Minister David Cameron interviewed by Andrew Marr on BBC | The Andrew Marr Show/BBC ‘I’ll pull UK out of the single market after Brexit’ Leaving the EU would be like planting ‘a bomb’ under the British economy, the prime minister warns.

David Cameron confirmed Sunday that he will pull Britain out of the single market if there is a vote to leave the European Union at the upcoming referendum.

The prime minister told the BBC’s Andrew Marr show that it would be impossible to copy the Norwegian model by remaining inside the trading bloc despite being outside the EU because that would mean accepting freedom of movement and trade rules made in Brussels.

He said the Brexit campaign had made it clear to voters that voting to leave also meant pulling out of the single market. The prime minister said he would accept the result as an “instruction” despite warning that leaving would be like planting a “bomb” under the British economy.

There have been reports that the House of Commons, whose MPs are overwhelmingly pro-Remain, could vote against pulling out of the single market in the event of a Brexit. MPs could claim they were accepting voters’ wishes to withdraw from the EU while protecting them from the economic consequences of leaving the trading area.

However, the Leave campaign has made it clear that in order to restrict immigration and strike trade deals with countries outside the EU, Britain would have to leave the single market.

The prime minister said: “What the British public will be voting for is to leave the EU and leave the single market.”

This would create a “decade of uncertainty,” he added, as the U.K. attempted to renegotiate a trade deal with the EU and countries around the world.

“Far from not banging on about Europe we’d be banging on about Europe for 10 years,” he said.

He said a vote for Brexit was a “DIY recession” that could leave the government with a £20-40 billion black hole in its finances.

“Who wants to vote for a shallow recession? This would be the first recession that would be self-inflicted,” he said and admitted the referendum was on a knife-edge. “Nobody knows what these polls are saying. It feels like a very lively and very full debate.”

Ukip leader Nigel Farage, interviewed before the prime minister on the show claimed there had been “a shift” in public opinion in the last fortnight.

“Collectively people are beginning to put two fingers up to the political class,” he said.

Farage also dismissed claims there could be another referendum if the vote was tight. “If the leave side were to narrowly lose, the chances of Parliament giving us another referendum is pretty slim.”

The Ukip leader also risked controversy after blithely dismissing the threat of a collapse in the value of the sterling in the event of an Out vote. Asked about the consequences of a weakened pound, the Ukip leader said: “So what?”

A lower pound was good for exports, he said.