My work has a whole fleet of class 7 Vauxhall Movanos, all the ones that were due MOT after the beginning of April had the extension applied the week they were due, as far as I know if you don't get the extension 3 days before the expiry date you can get in touch with DVLA here : [color=rgb(0, 0, 102)]:covid19mot@dvsa.gov.uk [/color]
If you worried about falling off your bike, you'd never get on.