Coronavirus (COVID-19): MOTs for cars, vans and motorcycles due before 30 March 2020
This GOV.uk page - linked below - tells you what to do if your vehicle’s MOT runs out before 30 March 2020 and you have coronavirus symptoms (and after symptoms)
It will be updated if anything changes.
It also contains a sub-link for vehicles due after 30 March 2020. MOT Advice