Violating lockdown has joined hate speech on the very short list of crimes that the mayor of London does want enforced. He favours having the army deal with lockdown violators.
Some 15 years ago, the lieutenant-colonel who was to handle a key part of lockdown if terrorists hit London with a bioweapon was someone I knew well. “Lucky you”, my friends said, when that chanced to come up in conversation. “While we’re being gunned down by the ruthless soldiery as we try to flee the capital, you’ll be able to slip through the lines.” – to which I replied (jokingly – they thought! 
), “You don’t know her. She’ll shoot down her friends with the others; why do you think she got the job!”
I think my friend would have made full colonel if she’d stuck with it, but the time demands on the rest of her life would have been too great and she is now happily pursuing other choices. I don’t know who would be in charge if the army were called in, but I hope they’ll have the same willingness to call Sadiq Khan out – not least because the only consideration that might make him and his kind hesitate to see the crisis as “a terrible thing to waste” is the worry that others might think the same.