Being the age I am I don't want to be cruel but I thought there was a mandatory test for all drivers over 70 or maybe I have misinterpreted what some newspapers have been reporting.
I can't claim to do this regularly, but about once a year I do 'practice' using my left foot on the brake and switching off the ignition while moving. I always do it on private roads of course
If you want to try it please please pick a deserted airfield or somesuch place the first time
