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A £500m government bailout for struggling accident and emergency units in England is merely "papering the cracks", doctors have said.

The British Medical Association said it was a sign that austerity had failed.

Prime Minister David Cameron accepted it was a "short-term measure" and that more needed to be done to improve A&E.

The money - which will come from existing budgets - will be deployed in A&E units and linked community services, such as pharmacies.

It comes after MPs said "confusing" and "contradictory" information relating to NHS crisis plans raised questions about whether the service would be in a position to cope better next winter.

'Disingenuous and demoralising'

The problems in A&E units have stabilised in the past few months, but from January to March the NHS - which has an annual budget of more than £100bn in England - missed its four-hour waiting time target as long waits hit their highest level for nine years.

More than 300,000 patients waited longer than they should have - a 39% rise on the previous year.

The prime minister told ����ý Breakfast: "Compared with three years ago, a million extra people are visiting A&E."

"The money helps in the short term," he also said.

"But in the longer term what we've got to do is get our hospitals working better with GP surgeries and also get our hospitals working better with social care departments so that the frail elderly - who are often the ones who are going in and out of A&E - are better cared for in the community."

The Department of Health said the £500m would be sourced from its own efficiency savings programme.

It will be focused only on the minority of A&E units which have the worst problems.

Dr Clifford Mann, president of the College of Emergency Medicine, told ����ý Radio 4's Today programme he had "real concerns" about how the money would be allocated.

"It seems disingenuous, and in many ways demoralising to those that managed to apparently perform satisfactorily, to understand or realise that they will benefit from this not at all," he said.

But the deputy chief executive of NHS England, Dame Barbara Hakin, defended the plans, saying the cash would benefit the hospitals facing most pressure this winter.

"Our good hospitals deliver a great service all the time but there are some that we know need some help to get them through this winter so that we can make the longer-term changes."

'Very welcome'

Earlier Dr Mann had cast doubt over the impact it would have, saying: "It is a short-term fix. It does not address the underlying cause - we have a shortage of doctors."

A spokesman for the British Medical Association (BMA) said it was right that the government was listening to the concerns of doctors and patients but added: "At a time when they are demanding cuts of £20bn across the NHS, this is nothing more than papering over the cracks.

"It is recognition that their austerity programme has hospitals facing ever increasing demands with diminishing resources."

Labour's shadow health minister Jamie Reed said: "David Cameron's A&E crisis is a symptom of wider problems in the NHS and care system, which this announcement will not address."

Liberal Democrat MP Andrew George, a member of the Health Select Committee, said the money was "very welcome", but the government had to ensure it was "put to best use" and "distributed fairly".