Like other posters, I'm EXTREMELY concerned that some police officers are literally taking the law into their own hands. Their job is to enforce the law as it has been made by government, not interpret it according to their own lights. There's very little consistency in the ways that various police forces have been acting over Coronavirus enforcement. This needs to stop!
Of course you shouldn't make a special trip out to buy just Easter Eggs. But do police officers have the right to look inside your shopping bags and judge, on their own terms, whether what you've bought counts as essential? No of course they bloody well don't. This is the thin end of the wedge.
I'm interested in what else they might view as inessential? My son relies on fairly esoteric sources for his protein since he's severely autistic and picky as fuck. I don't want some random cop saying my shopping basket containing pea crisps, nori seaweed strips and pumpkin seeds is inessential, because without those my son is going to be pretty badly malnourished.
What about the proportion of one's shop - essential:inessential? What ratio of essential to inessential products is acceptable? Can we say 80:20? What if I buy everything from Waitrose's 'Essentials' range? 
Clearly this is a bit of a souped up article to rabble-rouse and grab attention, but we need to strike a balance between compliance to save lives, and not allowing the police to become the law-makers. That is not their job.