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The Tories have been gearing up to the big reveal for their manifesto but they made a major blunder today getting the date of its launch wrong.

It takes place on Sunday but in a Twitter picture they said it was on Saturday.

Bungling Boris Johnson didn’t notice the howler either and retweeted it.

The PM reminded followers to ‘Vote Conservative’ as he reminded voters about the manifesto.

(Image: Twitter)

However, both posts were hastily deleted minutes later.

The Tories follow the Lib Dems who launched theirs on Wednesday and Labour on Thursday.

Earlier this week the PM accidentally blurted out a major policy.

Mr Johnson was caught on the hoof by a factory worker in Teesside who questioned him with on tax cuts for 'people like him' - and he revealed a massive rise in the National Insurance threshold

The worker asked: "You just said low tax. Do you mean low tax for people like you or low tax for people like us."

(Image: REUTERS)

Mr Johnson confirmed he plans to increase the threshold for paying National Insurance from £8,632 to more than £12,000.

He later clarified it would come in stages - rising to £9,500 "soon" followed by an ambition to reach £12,000.

He said: "I mean low tax for people of the working people."

Mr Johnson originally proposed raising the NIC threshold during the Conservative leadership contest last summer - although at that stage he did not put a figure on