DAVID CAMERON dropped his guard yesterday, letting slip that he was “delighted” to be slashing tax credits for poor people in work.

The millionaire Prime Minister made the telling comment under pressure from Jeremy Corbyn at Prime Minister’s questions.

Labour’s leader had quoted Tory MP Heidi Allen, who on Tuesday night used her maiden speech to argue that “too many people will be adversely affected” by the cuts — before voting for them anyway.

Mr Cameron ignored Ms Allen’s warning and insisted that the increased minimum wage would compensate for the cuts — a claim dismissed by the Institue for Fiscal Studies.

But, clearly rattled by the growing Tory rebellion, he said: “I’m delighted that once again this measure passed the House of Commons last night with a big majority.”

The comment was cheered by Conservative loyalists and Labour said it had unmasked the “true face of the Tory Party.”

Over three million families will lose £1,300 a year on average if the cut comes into force in April.

Shadow cabinet minister Jonathan Ashworth said: “It’s shameful that David Cameron is ‘delighted’ the cuts were voted through the Commons again last night.

“Despite his rhetoric, yet again we see the Tory Party is not the party of the common ground.”

A cross-bench peer who had tabled a motion in the Lords that could stop the cuts has withdrawn it under pressure from Mr Cameron, who claimed it would spark a constitutional crisis.

But Labour peer Baroness Meacher is seeking to delay the cuts, pending an independent analysis of their impact on families.

The proposal will then be subject to a fresh Commons debate and vote next week.