The determined family of a man who died before getting justice in the Horizon Post Office scandal has launched a petition calling for his case to be dealt with in parliament.

Roger Allen believed he was one of more than 900 sub-postmasters accused by the Department of Work and Pension (DWP) of stealing money because of incorrect information from the highly controversial Horizon computer system introduced in 2000.

However, Mr Allen - who was sub-postmaster of the St Johns Close post office in Lakenham between 1994 and 2002 - died at his home in Rackheath on March 9 without being able to clear his name.

Norwich Evening News: Roger Allen, a postmaster caught up in the Horizon Post Office scandal, died before his name was clearedRoger Allen, a postmaster caught up in the Horizon Post Office scandal, died before his name was cleared (Image: Keren Simpson)

New legislation was introduced on March 13 by the government - which is expected to clear the majority of victims by the end of July -  to speed up clearing victims' names and paying compensation, but this doesn't cover DWP prosecutions.

His daughter, Keren Simpson, continues to fight for her father's exoneration and has set up a government petition.

WATCH: Car set on fire by 'scumbag' arsonist in city neighbourhood

Keren said: "I believe everyone should be cleared because it's obvious all cases around that time are related to the Horizon scandal.

Norwich Evening News: The government petition needs to reach 100,000 signatures to be discussed in ParliamentThe government petition needs to reach 100,000 signatures to be discussed in Parliament (Image: Keren Simpson)

"I've received a lot of support from various avenues so I want to keep the momentum going and capitalise on it to clear my father's name.

"It only went live on Wednesday and there's already 300 signatures, but if I can get 100,000 it will go to Parliament - so that's the aim, which I know is no small feat, but it's possible.

READ MORE: Home is rat-free as housing association 'pulls its finger out' after year of stress

"With the scandal now in the public eye again I hope people will be sympathetic to the cause."

Norwich Evening News: Roger Allen died on March 9 at his home in RackheathRoger Allen died on March 9 at his home in Rackheath (Image: Keren Simpson)

Norwich Evening News: The St Johns Close post office in Lakenham, pictured in January 2003The St Johns Close post office in Lakenham, pictured in January 2003 (Image: Newsquest)

Mr Allen's case was dismissed by Court of Appeal judges in 2021 due to a lack of evidence that it was a "Horizon case".

A public inquiry into the scandal has been ongoing since February 2021 and has heard evidence from Post Office and Fujitsu employees - which developed the Horizon system.

However, the scandal became much better known after an ITV dramatisation was broadcast in January.

Norwich Evening News: Keren Simpson, Roger's daughter believes everyone should be cleared in the Horizon Post Office scandalKeren Simpson, Roger's daughter believes everyone should be cleared in the Horizon Post Office scandal (Image: Newsquest)