Thousands of victims of the infected blood scandal are being “harmed further” by long waits for compensation, the chair of the public inquiry into the disaster has said.

In a hard-hitting report, Sir Brian Langstaff said there were “obvious injustices” in the way the scheme had been devised.

It is thought 30,000 people were infected with HIV and hepatitis B or C in the 1970s and 80s after being given contaminated blood products on the NHS.

The government has set aside £11.8bn to pay compensation and has said it is cutting red tape to speed up payments to victims.

The inquiry’s main report into the scandal, published last year, found that the disaster could largely have been avoided if different decisions had been taken by the health authorities at the time.

It said too little was done to stop the importing of contaminated blood products from abroad in the 1970s and 80s, and there was evidence that elements of the scandal had been covered up.

In May of this year, Sir Brian took the unusual step of ordering two days of extra hearings after he received “letter after letter, email after email” expressing concerns about the way the government’s compensation scheme for victims had been managed.

His extra 200-page report, based on that evidence, found that victims had been “harmed further” by the way they had been treated over the last 12 months.