Campaigners demanding an investigation into police violence against striking miners at the infamous Battle of Orgreave 30 years ago targeted the dithering police watchdog's offices yesterday.

Frustrated Orgreave Truth and Justice Campaign supporters picketed the Independent Police Complaints Commission headquarters in Yorkshire over the length of time it is taking to decide whether to launch a full investigation into the police's actions during the miners' strike.

Police mounted a co-ordinated and brutal attack on miners picketing Orgreave coke plant in south Yorkshire on June 18 1984.

Fleeing miners were battered by mounted police and officers on foot.

Later, charges of riot against miners were thrown out of court after evidence emerged of police rigging statements.

But the assaults were never investigated and no officers were charged or even disciplined.

The Orgreave campaigners have been boosted by news that 13 police officers are being quizzed over their role in the Hillsborough football stadium disaster which happened five years later.

They have been inspired by the success of families of victims of the Hillsborough disaster in Sheffield where 96 Liverpool football fans died following a crush in one of the stands.

Politicians, media and police blamed the fans for the disaster.

But an independent inquiry in 2012 revealed a police cover-up, with evidence that police statements were concocted and other statements changed.

The inquiry prompted the quashing of "accidental death" verdicts at inquests into the 96 deaths. New inquests began this week and the Independent Police Complaints Commission is investigating.

Orgreave Truth and Justice Campaign secretary Barbara Jackson said: "This is a great breakthrough for the Hillsborough families.

"It has been achieved through their determination and we are just as determined to discover the truth about what happened at Orgreave, to find who was responsible and have them brought to justice."