We have taken a proportionate share of the figures for England, based on Pupil Level Annual School Census (PLASC) FSM caseload data.
Ar gyfer Cymru (a Lloegr), cymerir ystadegau etholiadol o ddata a gyflenwir i’r Swyddfa Ystadegau Gwladol (y SYG) gan Swyddogion Cofrestru Etholiadol.