Speaking at the opening of of the Scottish Conservative party's spring conference in Edinburgh, the prime minister is expected to say the referendum is "a major life decision" that shouldn't be made without knowing the full consequences.
He is expected to add:
And look at who's laying out those consequences: the governor of the Bank of England, the president of the European Commission, business chiefs from companies like BP and Shell; Alliance Trust and RBS; Lloyds, Barclays - the list goes on.
These are not political puppets, they are serious, non-partisan figures.
So, the idea that these are empty warnings and political scare-mongering is a myth - and we owe it to the people of Scotland to take that myth apart.
More top news
Mobile phone giant O2 has apologised after service suddenly went down in a number of areas across the UK, sparking a flood of complaints.
A grandma who became an online hit when her grandson started tweeting pictures of her balancing things on her head has gone viral - again.
Raincoats and wellie boots are the order of the day this half term, as forecasters predict a gloomy school holiday.