The SHA claims pupils receive lass funding in Wales
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Schools in Wales receive thousands of pounds less in funding compared to those in England, research suggests.
The Secondary Headteachers Association (SHA) claimed its research published on Thursday showed a wide gap between schools in Wales and England.
Welsh Education Minister Jane Davidson said she was "extremely disappointed" the SHA had not shared its findings ahead of publication.
She added that education funding in Wales was at an all-time high.
The report by the SHA is a follow up to figures published in December.
In that research, the SHA claimed schools in England received up to £200 more per pupil than those in Wales.
Thursday's report is likely to suggest similar figures.
The claims have been disputed by the Welsh Assembly Government and Ms Davidson said schools' funding in Wales was at record levels.
But Ms Davidson has, so far, resisted calls for an independent review of school funding, which some head teachers have called for.