May be worth considering using the 6 month available extension to minimise virus spread. Taking a vehicle for an MOT exposes the garage workers merely by your presence, plus any virus on the vehicle. It also exposes the owner and therefore those they live with in the same way by contamination whilst the test is done. It also involves a non essential journey.
Seems low risk in the scheme of things, but at present it is very easy to cost a life. Better to leave it I’d say till it can be done without risk.