Cable ties, luggage straps or string should be of no concern. They're very easily cut by the police, even if the person is uncooperative.
"Lock on" protesters have used things like bicycle locks and handcuffs to shackle themselves to railings or each other. These are difficult to cut without injuring the person, especially if they're not cooperating.
I'd argue cable ties, straps and string aren't capable of causing "serious disruption", and I assume the police/prosecutor agree. It's very concerning that the police made the arrests anyway.
(I also disagree with the law, but I'm more concerned that the police abused it.)
"Lock on" protesters have used things like bicycle locks and handcuffs to shackle themselves to railings or each other. These are difficult to cut without injuring the person, especially if they're not cooperating.
Here's the Public Order Act, rushed through and taking effect from 3 May, with the coronation on 6 May: https://www.legislation.gov.uk/ukpga/2023/15/enacted
I'd argue cable ties, straps and string aren't capable of causing "serious disruption", and I assume the police/prosecutor agree. It's very concerning that the police made the arrests anyway.
(I also disagree with the law, but I'm more concerned that the police abused it.)