If we end up with localised lockdown, which we almost certainly will, this whol Cummings fiasco will rear it's ugly head. Is not having enough money to pay your mortgage "exceptional" circumstances? Well apparently, yes, so go to work, even if you work outside the lockdown area.
What if you are visiting someone when lockdown occurs, are you bound to stay in the locale until lockdown is over? Or is getting home to your wife who has a sniffle, and can't be bothered mothering your child "exceptional circumstances"?. Again, apparently yes.
India have localised lockdown, but it is policed on all roads with a written permit to move from one area to another, we just don't have the infrastructure to do that, or indeed an app that would help.