1. Independent Scientific Advisory Group for Emergencies. Rethinking Christmas: A three point plan to keep families and communities safe. 11 Dec 2020. https://www.independentsage.org/wp-content/uploads/2020/12/Christmas-3-point-plan-final.pdf.
2. Cabinet Office. Guidance: Making a Christmas bubble with friends and family. 3 Dec 2020. https://www.gov.uk/government/publications/making-a-christmas-bubble-with-friends-and-family/making-a-christmas-bubble-with-friends-and-family#if-you-are-clinically-extremely-vulnerable.