Studies, including the UK government's own study (from the last government) showed that there was significant improvement in attainment for pupils from lower income backgrounds and also general health improvements. For about £400 per pupil per year you can create significant benefits for children and therefore future adults.
https://assets.publishing.service.gov.uk/government/uploads/... https://www.nuffieldfoundation.org/wp-content/uploads/2020/0...