It's good they are aware but this language is all wrong
It's not 'may' like it's something they are allowing, it is that they will discriminate against us if they don't allow it and in that case are wide open to legal action
They also can't demand to see the written prescriptions. Some people may wish to show it, but that's their choice - the labelled pack and corresponding ID is sufficient, even the police cannot demand to see a prescription