Expiring MOT test certificates were automatically extended for six months during the initial Covid lockdown, however that terminated on July 31, 2020. Despite repeated lockdowns, the government has not reinstated the certificate extension scheme.
Nevertheless, because the Omicron variant has shown to be extremely infectious and transmissible, it's likely that the scheme to extend MOT testing may be reintroduced if too many MOT test stations close though the government has given no indication that this is being considered at this time.
So, if you are thinking does Covid-19 affect my MOT expiry date, this implies that all drivers must have a valid MOT test certificate on their car, or it will be taken off the road.
Go through your Mot certificate to ensure that it is still valid, if not, book your car in immediately with a car garage in Reading to avoid a fine and points on your licence.