I was a Met Police detective in the Freemasons and this is why I left it.

A MET Police detective, who spent four of his thirty years on the force in the Freemasons says that he was told to leave by a very senior officer.

Retired detective Mick Randall (above), who now runs private investigation firm Fedora investigations, said the lodge he was in turned out to be, unbeknown to him, linked to "unbelieveable corruption."

He posted on Linkedin after the Met Police announced on Thursday that all officers must now declare any past or current involvement in Freemasonry.

He wrote: "I was for four years out of my thirty years a Freemason.

"I left because I was told to, by a very senior officer.

"I had no idea why at the time.

"I resigned in ‘good order’ (paid my subs) and then days later arrests were made at the lodge connected to unbelievable corruption.

"Did I see that corruption at the time? No.

"Why didn’t I see It?

"Because it was not the Lodge itself but those connected to it?

"They called themselves the ‘Brothers in Law.’ They were basically a corrupt luncheon club

"‘Some’ connected to this group were former cops who were ‘totally corrupt’ and ‘apparently’ fed off some of the current cops within the lodge.

"This was just down the road from where Daniel Morgan had been murdered.

"Do I think what has just been announced to be correct?

"Absolutely.

"Do I think Masonry is inherently corrupt?

"No, I don’t.

"However, lurking around these organisations are corrupters who seize on opportunities, and many Masons are well oiled after meetings."

He said that chapter 8 of the book he wrote, Twilight Creepers, gives an example of how all this can play out.

He added: "We are not playing here. These are dangerous individuals."