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The website parents in England use to apply for financial help with childcare must be improved, says Nicky Morgan who chairs the Treasury Committee, .

Parents first reported glitches with the Childcare Service website mid-May - just weeks after it was made live.

HM Revenue & Customs, which runs the site, says it is "working to improve the way the service works".

But in a response to a letter from the head of HMRC, Ms Morgan says thousands of parents are still unable to apply.

The Childcare Service website enables parents to access help with two new government-funded childcare schemes:

the tax-free childcare scheme

the offer of 30 hours' free childcare for all three- and four-year-olds.

Parents can apply for both with one online application.

Complaints

Earlier this month, Ms Morgan's raised concerns about the website and demanded answers from HMRC.

Jon Thompson, HMRC chief executive, said: "We have received 1,507 complaints - this represents less than 1% of all customers.

"Over 90% of complaints have been concerned with technical issues; 1% are about eligibility; and 1% are about customer service.

"We are unable to say definitively how many parents have experienced intermittent difficulties at some point when trying to access their childcare account.

"When parents report difficulties accessing their account, we are able to issue all eligible parents with their 30-hours code manually or, for tax-free childcare applicants, make a manual payment to their childcare provider on their behalf."

But, in her reply, Ms Morgan said: "Whilst it is welcome that HMRC has made 'significant improvements' to the website since it was launched in April, thousands of parents are still unable to apply for the childcare to which they are entitled, in the way that the government has envisaged.

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"Clearly, further improvements are still required.

"The committee will no doubt want to question representatives of HMRC on the technical issues with the Childcare Service website when they are called to give evidence."

Nursery providers said the glitches meant thousands of parents and childcare providers had been adversely affected.

Neil Leitch, chief executive of the Pre-school Learning Alliance, said: "While we welcome Nicky Morgan's intervention on this matter, it really is a case of too little too late.

"Both the 30 hours' 'free childcare' and tax-free childcare were key Conservative manifesto promises, which the government seem wholly unprepared to deliver.

"The very least we expected was investment in an IT system that parents are able to use, and through which childcare providers are able to receive the payments that their businesses rely on."

Parents unable to access their childcare account can phone the HMRC helpline on 0300 123 4097.