Watch: Boris Johnson to face a grilling in Prime Minister's Questions

Boris Johnson is expected to face tough questions today in a week that has seen a return of ‘Tory sleaze’.

The Prime Minister has been accused of lying over flat renovation costs, with his own spokesman refusing to say whether he received a loan from the party to pay for it.

Today, the Electoral Commission announced a formal investigation will take place into the makeover of Boris Johnson's Downing Street flat

Watch events unfold here from 12pm.