A whole new world of council fighting has appeared

I fail to see how a PSPO could grant a power of arrest.

Yes. It seems like it is a system that relies heavily on compliance.

Everyone has powers of arrest; the citizen's arrest. However, that is strewn with elephant traps.

    "Any person can arrest a person who is in the act of committing an indictable offence or
    Anyone whom he reasonably suspects to be committing such an offence, if
        it is not reasonably practicable for a constable to make the arrest instead and
        there are reasonable grounds for believing that the arrest is necessary, for one of the following reasons:

To prevent the person in question:

    causing physical injury to himself or any other person;
    suffering physical injury;
    causing loss of or damage to property; or
    making off before a constable can assume responsibility for him."

As everyone here well knows, an indictable offence is one that is tried at Crown Court. 'Not being in possession of a plastic bag', from memory, isn't in the list.

This story reminds me of the controversy a few years ago when Manchester City Council brought in 'Environmental Enforcement' officers, ostensibly to discourage littering in the city centre. At some point they farmed this out to a private company who kept 75% of the money, leading to some rather over-zealous enforcement.

This is excellent news, about time they did something about dog poo.  As a sufferer of OCD, it ruins my day if I tread in it.

I read a few years ago that in parts of Spain, a dog owner is required to have their dog's DNA registered.  Then then test the poo and fine the owner.  I'd love to see that here too.

"What do you do for a living?"
"I work for the council running DNA tests on dog poo"

This is excellent news, about time they did something about dog poo.

Minority Report was a work of fiction.