THE GREEN Party raised questions over police accountability yesterday after reports emerged that secret files kept on peer Jenny Jones were destroyed in a cover-up of spying operations on political activists.

Baroness Jones of Moulsecoomb, who is also a member of the London Assembly, discovered two years ago that she had been placed on the Metropolitan Police database of “domestic extremists.”

Files obtained through data laws revealed that records were kept of her movements between 2001 and 2012 — even as she sat on the committee that scrutinises Met operations.

Now serving police officer Sgt David Williams has turned whistleblower to expose how other files were deleted to prevent the extent of spying being found out.

Mr Williams, who worked in the “domestic extremism” unit for five years, wrote to Mr Jones as a “last resort” after Met bosses dismissed his concerns.

The officer wrote: “I didn’t become a police officer to monitor politicians or political parties, nor to pay casual disregard to policy and procedure.”

The Met admitted that files were destroyed but claimed it was part of an improvement in its record-keeping and insisted it did not act “inappropriately.”

But a Green spokesman said: “These fresh allegations — that some of those files have been erased in a highly irregular fashion — are deeply concerning and demand thorough investigation.

“If proved correct, it brings into question the entire democratic accountability of the police and their role in protecting all of our basic rights.”