He said Brexit would have a ‘devastating impact’ on vital infrastructure projects financed by the European Investment Bank across the UK.
The bank has invested more than 16bn in UK projects over the past three years and leaving the EU would ‘see us wave goodbye to this crucial funding’.
Mr Cameron said: ‘ We know leaving the EU would result in an economic shock in the UK, after which we would be permanently poorer.
‘We also know businesses would lose access to the single market of over 500 million people, and the contraction of our economy would mean less money for public services.’
However former London Mayor Boris Johnson, leader of the