You have zero argument or justification.
Given virtually all at risk people have already been offered vaccines quite some time ago, and given the risk of transmission outdoors is negligible, and given the individual(s) with the irrational phobia of unmasked human faces can choose to wear an N95 mask if they wish, there can be no justification for saying it is "reasonable" to break the law.
I destroyed your argument; to claim I have no argument is absurd.
Whilst I entirely agree with the sentiments, the difficulty seems to be that this doesn’t seem to have been tested in court, though I seem to remember there have been a couple of minor cases involving supermarkets (no doubt settled before reaching court)?
As it’s quite clear the example this thread is based on has been doing this for a while, it’s not a new thing, it does (unfortunately) seem to be the case that no one is sufficiently bothered to test the law. They’re not the only business doing this - there’s Bridgnorth Cliff Railway for a start (I presume they’re still same as they were last year), and even a walk round my town will find plenty of “no mask no entry” signs in shop windows, including a few extra nasty ones with wording like “cover your face you big dirty disgrace”.
Presumably a shop who wanted to enforce a policy that every person wears a mask could do so providing they made a reasonable adjustment to accommodate exemptions, which could presumably include (in a small shop) allowing no one else in at the time and serving them from behind a protective screen, or perhaps serving them outside. Could the ferry operator in question reasonably claim that the nature of their operation means they’re unable to practicably adjust?
I’m not advocating any of this, on the complete contrary I completely object to masks, just saying that unfortunately it hasn’t really been tested, and the body of public opinion (again unfortunately) seems to fit into two camps - obsessively pro-mask and keep the peace. The government’s very lackadaisical attitude to exemptions unfortunately reflects and encourages this.
If masks do get binned next month, though it does unfortunately seem like transport may well be the exception to this, no doubt we will see some businesses choose to keep mask requirements. Let’s hope there is a high-profile challenge.