Seven terror plots have been foiled in the six months since the Westminster attack, the Sadiq Khan has revealed.

The London Mayor said counter-terror experts have told him there has been a shift in the threat, rather than a spike in attacks, this year.

There have been five attacks in Britain this year but police have thwarted more potential attacks over the same period of time.

In March five people died when Khalid Masood drove at pedestrians on Westminster Bridge in central London before stabbing policeman Keith Palmer to death in the grounds of the Palace of Westminster.

Between June 2013 and the Westminster attack, 13 attacks were thwarted.

Mr Khan told a Guardian live fringe event at Labour's party conference in Brighton: "The phrase used by police experts, counter-terror experts, in relation to terrorism is what we're seeing is not a spike but a shift.

"And the reason why they say that is because if you look at the time when Fusilier Lee Rigby was murdered in 2013 up until the Westminster Bridge attack this year, there were 13 terrorist attacks thwarted because of the excellent work of the police and security services.

"If you look at the time between March of this year and now, yes there have been four terrorist attacks (in London) but there have been seven that have been thwarted."

The figure is one more than the number previously released. Earlier this month, senior national coordinator for counter-terrorism policing, Neil Basu, said six plots had been stopped since March.