24. Schools whose budget shares would otherwise be reduced year-on-year by a percentage figure of 3% or more, determined by the authority: the authority must publish that percentage figure and an explanation of how any amounts using such a factor or criteria will be determined including, if applicable, the use to be made of any sliding scale. Such a factor may not take account of the extent to which a school has spent more than or has not spent all of its budget share in any financial year.