Picket parties

I bet Tory MPs haven’t read their own government’s advice (National lockdown: Stay at Home - GOV.UK (www.gov.uk)) on what constitutes a reasonable excuse for leaving home during lockdown. They'd be mightily displeased if they did:
 
There are further reasonable excuses. For example, you may leave home to fulfil legal obligations, or to carry out activities related to buying, selling, letting or renting a residential property, for the purpose of picketing, or where it is reasonably necessary for voting in an election or referendum.
 
PICKETING!! This heinous activity is permitted—or is it?—it’s not later on listed as one of the reasons for meeting other people. Thankfully, nobody who organises raves, etc. is likely to pick up on the point, but one could see how, provided they chose a suitable target, brought some banners and devised a slogan or two, picket parties could become the new rage. But do we have anything to rage about? I’m scratching my head.