Can't feel but think this will hit 1901 renewals. Expecting people to just hang about for at least 45 minutes after doesn't really work. Not like they can have a few beers as they'd be driving. Totally unworkable
Will never work in principle. If someone wants to leave, get in their car and drive home at any time, for what ever reason (family emergency, other arrangements etc) they should and will be able to.