Sir Alan Bates accused the government of offering “accepting or leaving it” less than half of the compensation he claimed.

The former deputy, who had remedyed victims of the Post Office scandal, said ministers presided over the “quasi-kangaroo court” and changed the “target post” in terms of their verdict.

"Actually, and has been eliminated, because legally you will not be able to make them, or the parameters of the program will not be extended to certain projects," Sir Allen wrote in the Sunday Times.

"Anyone who is not satisfied with their offer can be reviewed by a panel of experts," the Ministry of Commerce and Trade said.

Between 1999 and 2015, more than 900 subtackers were wrongly prosecuted after Horizon IT system errors indicated a deficiency in the post office branch account.

Sir Alan led a group of 555 sub-tackers who participated in legal proceedings against the Post Office's Landmark Group.

Last year, the ITV drama about the scandal, Mr. Bates and the Post Office, their battle for justice was initiated by the ITV drama.

The government continued to establish a specific compensation fund to ensure that these sub-owners received additional money to reflect the gravity of their situation, but progress was described as slow and many were still waiting for payment.

Under the Panel Litigation Order (GLO) scheme, claimants can receive £75,000 or seek their own settlement.

Sir Allen said the guaranteed compensation plan would be "illegal profit" and proved "worthless".

He also called for the creation of an independent agency to provide compensation plans for this and similar public sector scandals.

Sir Allen said the three and the latest proposals accounted for 49.2 per cent of his original claims.

He rejected the previous proposal in May 2024, about one-third of what he asked for.

He described the first proposal in January 2024 as "cruel" and "derisory".

As of January, £128 million has been paid, including temporary payments, according to government data.

A spokesman for the Ministry of Commerce and Trade said: “We pay tribute to all the Post Offices that have suffered this scandal, including Sir Allen’s unremitting efforts to seek justice for his, and the total amount we have paid to the Post Office has tripled.

"We recognize that given the length of time that has passed, we will have no evidence, so our goal is to provide questions to the postmaster as much as possible. Anyone who is not satisfied with the person they offer can review their case review by a panel of experts, and the experts have nothing to do with the government."