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[Q]: Funding can vary by as much as £3,000 per pupil but the government has pledged to even things out.
The Association of School and College Leaders is urging ministers to "grasp the nettle" on fairer school funding.
The Department for Education has said it increased the budgets of the 69 least fairly-funded areas for 2015-16.
Historically, more money has been channelled towards areas that have high levels of social need, with cash targeted towards those in the inner cities and areas of deprivation.
Heads argue the disparity between higher and lower funded areas has been magnified by the pupil premium - money targeted at children from poor backgrounds - with £1,320 per child at primary level and £935 in secondary schools.
Additionally, schools are facing increasing pressures on their budgets because of the rising costs of pensions, national insurance contributions and teachers' pay over the coming years.
Malcolm Trobe, deputy general secretary of the Association of School and College Leaders, told the Times Educational Supplement that England's worst funded schools were "not going to be able to afford to put teachers in front of classes" without additional money.
He adds: "It is essential that fairer funding proposals are brought forward as soon as possible. This issue has gone unresolved for too long and previous governments have failed to grasp the nettle.
"The complexity of introducing a fairer funding formula and the need to phase in the new arrangements mean it must be dealt with early in the Parliament. The opportunity to resolve this issue must not be allowed to slip away once again.
"A new formula should establish a sufficient base level of funding per pupil, with additional funding to reflect disadvantage which incorporates the existing pupil premium.
"To be clear. We are not calling for the end to the pupil premium. Our approach is to have a single deprivation funding stream rather than the two that currently exist - one of which is the pupil premium - as this would lead to a fairer distribution of the funds."
The concern has been raised only days after the new Education Select Committee chairman Ian Carmichael wrote to Education Secretary Nicky Morgan asking when the government would be publishing its plans to shake up school funding.
The DfE has committed to introducing a national funding formula after the next spending review.
And it has put an extra £390m into the schools budget for 2015-16 to increase the per pupil budgets of the 69 least fairly funded areas.
"We are ensuring schools across England are funded fairly so that all pupils, whatever their background and wherever they live in the country, have access to a good education," said a spokesman.
"This is a priority for the government and a key part of our core mission to extend opportunity to all.
"These are complex reforms that we have to get right."
[A]: Huge regional disparities in funding could leave schools without teachers unless they receive some extra money, say head teachers.


[Q]: Little is known about critical care delirium, or ICU psychosis, which triggers psychological effects in patients in intensive care.
During delirium some patients believe doctors are trying to kill them, they see ghostly figures, suffer hallucinations and anxiety.
Most patients recover quickly with the correct help.
A recent study found that some 55% of people who survive intensive care treatment  go on to develop psychological disorders like depression or post-traumatic stress disorder.
Frances, who did not wish to give her surname, was in intensive care in the Royal Victoria Hospital in Belfast for four weeks following complications during her second heart bypass.
She had never heard of critical care delirium.
"When I became aware, firstly, I had terrible hallucinations. Other patients were not in their beds, they were in pop-up cars. There were people dressed as ninjas at each side of the bed.
"I felt they were going to harm us and we had to be good. Looking back now I believed they were trying to kill us and they did it by injecting your stomach.
"On one occasion, I even hid in a cupboard to try and stop them killing me.
"When my family came to see me I was begging them to take me home and told them if they didn't take me home I would be killed that night. I started to text people and tell them to come and get me. It was worse for my family knowing I was so unhappy," she said.
"It would be reassuring for families to know that it is actually a condition and it's not just happening to you.
"You do feel very embarrassed about it and you don't want to bring it up because you feel so embarrassed."
A recent study of 157 patients at University College Hospital, in London, found high levels of depression, anxiety and post traumatic stress disorder.
Dr George Gardiner, a clinical lead at the Critical Care Network in Belfast, has been studying critical care delirium. He said the condition is not unusual.
"The symptoms are caused by the environment and the critical illness suffered. They are upsetting and unsettling for the family and friends who will also see what is going on. It is something we in the intensive care unit have been concentrating on for the last ten years," he said.
International research has been focused on trying to improve how to spot the symptoms to treat the condition and the Critical Care Network has developed a number of scoring systems to try and pick it up at the earliest stage in patients.
"There are a series of cognitive tests to see if a patient is in the zone of delirium and that is what Frances has been experiencing, a condition called critical care delirium.
"There are a number of strategies which can be used to try and normalise the environment. Introducing night and day when that can be done, reducing sedation when possible and freeing patients from the equipment. That's something that we are trying to push forward here in Northern Ireland."
Dr Gardiner explained that, by definition, a patient in intensive care has a critical condition and that it is not surprising that the brain starts to malfunction in this way.
He understands how patients can begin to slip into delirium.
"By the very nature of the monitoring we have to do and the equipment that is needed to support your organ systems night and day it can be difficult to differentiate, there can be noises, there are alarms and there is always a stranger, albeit a nurse in the room with you," he said.
"Never the less it is quite common for patients, especially the more critical patients, to lapse into delirium and sometimes it can be quite difficult to pick that up."
Dr Gardiner has been involved in trying to reduce the chances of patients suffering from delirium.
"The strategy we employ in NI is to have the patient as lightly sedated as possible and move them out of intensive care as soon as possible. We are having good success at this.
"We never get the opportunity to let people know that delirium is a common effect of being in critical care and we are looking out for it and we can treat it. Most people will make a good recovery. It might take a bit of time but patients should be assured we are on top of the issue.
"We can treat this and people will get back to normal."
[A]: It is a condition which is rarely talked about and most people are too embarrassed to mention it after they recover.


[Q]: Arter, 27, was signed from non-league Woking for £4,000 in 2010 and became a key player for the Cherries during their rise to the Premier League.
The Republic of Ireland midfielder, who began his career at Charlton, made 35 appearances for Eddie Howe's side last season as they finished ninth in the top flight.
Arter made his international debut in 2015 against England and has six caps.
"Once I heard the club wanted to give me a new deal, it was a pretty easy decision," he said. "The team has been successful over the last few years and you want to be part of somewhere that is continually progressing."
Meanwhile, Bournemouth say they have identified an area of land on which they intend to build their new stadium.
The club have found a suitable location within Kings Park, with support from Bournemouth Council, and hope to have their prospective new home completed by the summer of 2020.
Bournemouth announced they would leave their current home, the 11,450-capacity Vitality Stadium, in December.
The council had previously stated it would not welcome a "significantly bigger stadium" in the Kings Park area of the town.
[A]:

assistant: Harry Arter has signed a new four-year contract at Bournemouth.