Chris Whitty and Patrick Valence have consistently failed to mention the potential benefits of adequate Vitamin D levels in Covid19 patients. The following links are a sample of references relating to Vitamin D and infectious diseases, which those two senior medical advisers should be aware of. Sensible supplementation with Vitamin D carries no risk but can be of great benefit. There is no excuse for not making this information available.
https://pubmed.ncbi.nlm.nih.gov/27714929/
https://pubmed.ncbi.nlm.nih.gov/20067648/
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2770157
https://www.medrxiv.org/content/10.1101/2020.09.04.20188268v1.full.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7455115/
https://www.mdpi.com/2072-6643/12/9/2757
http://www.societaitalianadiendocrinologia.it/public/pdf/hypovitaminosis_d_covid19.pdf