It comes after a group of backbench Conservative MPs have put their support behind the f40 campaign group, which is seeking funding reform.
The MPs, many of whom represent areas which are among the worst-funded, reportedly want changes in the national funding formula to be detailed in July's Budget ready for inclusion in next year's spending round.
Earlier this year, an analysis by the Association of School and College Leaders (ASCL), found that for 2015/16 an average school in the 10 best-funded areas will receive £1.92 million more than one in the 10 worst-funded areas.
In the 10 best-funded areas, the average per-pupil grant for 2015/16 will be £6,297 – compared to just £4,208 in the 10 worst-funded areas.
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