Also just back from Spain and agree that it feels much safer there and taken seriously. In my mind it is hard to see this as anything other than a stunt / move to deflect attention away from our governments haphazard management of the virus.
Seeing as the region I visited in Spain had ZERO cases in the past 10 days; would I be quarantining? No chance... Upon Landing back in the U.K. last week there was nobody collecting or checking arrival forms!!
We filled ours in on-line in Immigration, then proceeded to the Border Force staff, who were completely uninterested. I could have put absolutely anything on the form - there's no checking whether it's accurate, and therefore absolutely no way you can be traced (and checked upon). The system is ridiculous!