The number and proportion of pupils eligible for and claiming free school meals is published at the annual ‘Schools, pupils and their characteristics’ statistical release:
Data is not summarised by parliamentary constituency, but data for each school is available in the Underlying data: SFR28/2017 of the annual ‘Schools, pupils and their characteristics’ statistical release, contained in file ‘SFR28_2017_Schools_Pupils_UD’. The figures can be filtered by school phase (column N), Local Authority name (column H) and parliamentary constituency (column V). The number and percentage of pupils taking a free school meal on census day can be found in columns EB and EC, respectively, while the number of pupils known to be eligible for free school meals can be found in column ED.
Information for earlier years (from 2010 onwards) can be found at: