BORIS JOHNSON has vowed to press on with leaving the European Union, saying that he is “undaunted” by Parliament forcing him to seek a Brexit extension with EU leaders.

In the first Saturday parliamentary sitting since 1982 Mr Johnson suffered fresh defeat after MPs voted to back the Letwin Amendment by 322 votes to 306.

It took place as a march some estimated as large as a million people demanded a second referendum on the EU, addressed by shadow cabinet members including John McDonnell and by former prime ministers John Major and Tony Blair.