In 2010, the issue was back in the spotlight when health minister Anne Milton suggested in a leaked letter to Scottish Public Health Minister Shona Robison that the government was planning to end the scheme by April 2011.
She admitted ending the scheme was "highly controversial" but said the programme had "become increasingly outdated" and its cost had almost doubled in the last five years - with the cost in England at nearly £50m and rising to £59m in 2011-12.
It was an idea Downing Street said Mr Cameron "did not like".
The School Milk Campaign says with one child in three in Britain going to school without breakfast, a glass of milk in the morning can provide a much-needed boost.
The government agrees, rejecting suggestions the scheme could be scrapped twice in the past year - perhaps meaning drinking milk with a straw will continue to feature in the memories of small children for years to come.