A head teacher has resigned in protest over the school funding crisis, telling parents she had not gone into teaching to cut the number of teachers or increase class sizes.
Mary Sandell, head of the Forest School in Winnersh, Berkshire, has written to parents about "bleak" funding problems.
Head teachers across England have been warning of budget shortages - with threats of cutting school hours.
The Department for Education has said schools have record levels of funding.
In a letter sent to parents, the secondary school head teacher…