But the Royal Mail confirmed that there is no way to opt out of the mailshot, meaning all 27million homes in the UK will receive it starting next week.

But last night Mr Cameron stood by his decision saying he would make "no apology" for the leaflet.

He insisted that the Government was "not neutral" in the referendum and the cost was "money well spent".

However, he did admit that the debate in his own Cabinet had become “abrasive” and “difficult”, his first acknowledgement of the growing split in the Tory Party.

However, eurosceptic ministers and MPs were left furious at the decision to send out the leaflet to every home in the country.

A number of senior Conservatives on Thursday asked Steve Baker, the eurosceptic MP running Conservatives for Britain, to approachDescription

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