declare martial law in 1 weeks time
inform every Brit abroad that the borders will shut and stay shut on that date so if they want to come home they need to get a shift on
give everyone a chunk of foodvouchers (thanks PC) to stock up on food, booze, drugs and ahem reading matter
lock the country down completely on said date for 4 weeks
no one leaves their home, or wherever they have elected to stay, until the 4 weeks are up
during that period only the military are allowed on the streets, with military medical personnel responding to emergencies and using the nightingale hospitals as required
after 4 weeks, borders remain closed, essential imports only (food and meds) are allowed with all non perishable goods held in storage for 2 weeks after off-loading by military personnel, who effectively stay behind a border wall for their shift, then isolate for 2 weeks after their tour ends
perishable goods imports are kept to a minimum and are sanitised where possible by a dedicated military team operating as above
Virus is all but eradicated in the UK, economy is bolloxed but will recover in time, rest of the world sits back and applaudes, then follows suit. 6 months later everyone has forgotten about Covid-19
I get elected world leader, but don't worry I'll be a benevolent overlord, at least to start with