https://www.gov.uk/government/publications/flu-vaccines-and-supply-for-the-national-flu-programme-2020-to-2021/flu-vaccines-and-supply-for-the-national-flu-programme
https://www.gov.uk/government/publications/flu-vaccination-why-you-are-being-asked-to-wait/flu-vaccine-supplies-and-why-you-need-to-wait-for-your-vaccine
