Rowley believes it may take at least a decade to weed out Met bigots

Sir Mark Rowley, the Metropolitan police commissioner, believes his force's corruption crisis is so deep it may take a decade or more to detect and remove pockets of bigots operating around Britain's biggest force, the Guardian understands.

- Vikram Dodd

The Met has started an urgent review into whether officers recorded in a BBC Panorama documentary bragging about using excessive force and showing bigotry, had corrupted cases they worked on.

Amid the fallout from the undercover investigation into Charing Cross broadcast on Wednesday, Rowley tried to demonstrate he understood the seriousness of the crisis and was attempting to stem any blow to public confidence.

The prime minister described the footage as "shocking". Rowley has summoned Met leaders, from chief inspector level upwards, to an emergency meeting today where he will tell them to improve standards, root out wrongdoing or quit the force.

The programme broadcast footage from a seven-month undercover investigation. Met officers were recorded calling for immigrants to be shot, being dismissive about a rape complaint and making anti-Muslim and misogynist comments.