Police revoked the rights of gun owners in Hertfordshire hundreds of times in 13 years, figures show.

Home Office data shows Hertfordshire Constabulary revoked two licences and refused to renew one in the year to March.

In the same period, the force approved 401 new applications for firearm or shotgun licences.

Since 2008, when recording began, officers have approved 7,998 applications but revoked 256 licences and refused 20 applications for renewal.

A firearms certificate can be revoked for several reasons, including if a holder presents a danger to the public, is of "intemperate habits or unsound mind", no longer has a good reason to possess a firearm or has failed to comply with conditions under which the certificate is held.

The data shows that more than 560,000 people across England and Wales held shotgun or firearm licences in March, including 9,955 in Hertfordshire.

The Government is now preparing to publish statutory guidance in an effort to ensure "greater consistency and higher standards" of decision making around firearms licensing.

Changes are likely to include greater scrutiny of an applicant's internet and social media use.

But the British Association for Shooting and Conservation says the process has taken too long, with a spokesman adding that the organisation had warned successive Government ministers of deadly consequences if stricter vetting processes were not implemented.

BASC is calling on the Government to introduce a statutory obligation that would see a marker included on medical notes indicating whether a patient had access to guns.

Christopher Graffius, from BASC, said: "I have been calling for this since 2013 and have told ministers that we would end up with people dead, likely women."

He added: "It is in the shooting community's interest to ensure public safety and it is absolutely awful to see tragedies like this."

Gill Marshall-Andrews of the Gun Control Network said most licensed gun owners were law abiding, adding: "But what is clear is that the more guns there are in circulation the greater the chance of an atrocity like this one in Plymouth.

"We need much more oversight of gun owners in this country."

A Home Office spokesperson said: “Incidents such as Thursday’s horrific events in Plymouth are thankfully rare, but their impact is profound, not only on those directly affected but on the public as a whole.

"We constantly assess what sensible and proportionate steps we can take to help prevent such terrible loss of life happening."