The Department for Work and Pensions has again refused to release data about the impact of changes to the disability benefit system after a request under the Freedom of Information Act.

Last week the DWP was forced to reveal how many people had died shortly after being found fit to work by disability tests.

Ministers and officials had resisted the demand for months and only accepted it after a warning from the Information Commissioner and a campaign that went all the way to Parliament.

But on Tuesday DWP officials refused another request for basic information about disability benefits using the same “Section 22” exemption they had tried to use before.

The Department had been asked under the Freedom of Information Act to disclose how many Disability Living Allowance claimants had been made worse off after being moved onto the new Personal Independence Payment benefit.

The Department refused the request, made by a user of the WhatDoTheyKnow website, a tool which helps people scrutinise the Government’s record.

Some claimants have lost out from the move from DLA to PIP

The reason given for rejecting the request is the same as that given in the case of the death statistics – under section 22 of the Act, data which officials say is reserved for future publication can be blocked from release.

The Department also previously stalled on responding to the request based on the fact that the person who made it had initially used a pseudonym.

The civil servant who answered the reply ultimately said that thought there was a public interest in the data being released, they should be allowed to publish it “in a manner of form and at a time of their own choosing”.

“I can confirm that the Department holds the information you are seeking. However, Section 22 of the Freedom of Information Act exempts this information from disclosure. This is because the information is intended for publication at a future date,” the Department said in its reply.

“This exemption requires the public interest for and against disclosure to be weighed in the balance. There is a public interest in information being released as soon as possible. However, I am satisfied that there is a strong public interest in permitting public authorities to publish information in a manner and form and at a time of their own choosing.”

Disabled people are being transitioned by the Government from the Disability Living Allowance benefit to its placement, the Personal Independence Payment. Some people lose out from this change because of the new way in which the PIP is calculated.

One person affected by a payment cut, Jayne, wrote in her blog about the difficulties the changes had made for her and criticised the DWP's lack of transparency.

"I have found myself so behind with bill payments, I now am past ‘robbing Peter to pay Paul’ and am at the bailiffs knocking on the door stage," she said.

"Once again the DWP hide behind Section 22, but fail to indicate when these figures are to be produced; could this be because the data once revealed, will show another proven case of how the Welfare Reform Act is persistently failing disabled people?"

In the case of the benefit death figures, the Information Commissioner said the Government had no good reason to withhold the stats under Section 22.

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Mr Duncan Smith at one point caused confusion when he told Labour MP Debbie Abraham in Parliament that the stats did not exist.

“She knows very well that the department does not collate numbers on people in that circumstance,” he told her in Parliament.

The block comes after ministers announced a crackdown on the Freedom of Information Act, which Justice Secretary Michael Gove needed to be “revisited”.

Civil servants have long complained that disclosing information can be time-consuming and costly, and that ministers and officials should be allowed to discuss things in secret without the public knowing.