Interesting that @LindsayHoyle_MP chose to rebuke @Jeremy_Hunt over his lack of a tie on a zoom call. This is advice the Dept of Health previously issued about item of apparel. Source: http://www.em-online.com/download/medical_article/36144_Infections%20from%20Uniforms.pdf
BMA also issued its own advice. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1382570/
Source: https://www.sciencedaily.com/releases/2004/05/040525062317.htm - though should note this is a reference to bacteria. Covid is of course a virus.
Then there’s this nugget from the FT predicting the rise of Zoom means next ties are doomed, in any case. https://www.google.co.uk/amp/s/amp.ft.com/content/73df43fb-259e-4254-8dfa-083979c9743a
In any case the previous speaker relaxed the rules on wearing neckties in the HoC anyway. https://www.bbc.co.uk/news/amp/uk-politics-40446102
In fact the bible of dos and don’ts for MPs explicitly says they don’t have to. https://erskinemay.parliament.uk/section/4889/members-dress/?highlight=dress