Not really surprising news TBH.
The UK really didn't police lockdown in the way that many other nations did so I doubt they'll suddenly get a grip over quarantine..it'll be "quarantine" lite: Just enough to look good politically and seriously inconvenience those who need to take the threat of sanctions seriously but not enough to deter those whose motto is "does it look like I'm bothered" .
I think the jury is still out over temperature checks..isn't the thought that you can be infected but asymptomatic for several days?