People were being fined for getting a cup of coffee and going for a walk. Hope all the people fined kick up a massive stink.
They'll might walk it back and say "all fines will be refunded as, in hindsight, it wasn't fair" like they did when they tried to relax rules right after the Cummings scandal was published.
And then the investigation won't find that Boris has done anything illegal, and since it's not an investigation into misconduct - which Boris himself would have to request, since we now live in a mad country - he'll survive unless his party force him out.
I just don't see him going, there's still too much shit that will get worse. None of the potential new leaders want it right now. Fuel poverty, Russia about to say "Iol feck it this is ours" again, Brexit means Brexshit, Evergrande crisis. Who would want to be known as the PM during all of that?! Best let Boris handle that shit as well.