@GeofCox

Yes, and that's very stupid, but it's not a test of the meaning of the law, just what the police have been told to do. Nobody's going to get found guilty in court and go to prison for a Plasticine Action t-shirt.

More, it's still not transitive. Supporting the guy with the Plasticine Action tee isn't legally equivalent to supporting Palestine Action, so if he went to Tesco to buy a sandwich, Tesco wouldn't be in trouble for selling him one.

The claim being made by Faber is a lie.