As for my thoughts on the proposals. I am probably in a minority here when I say that I don't massively mind wearing a face mask. I would in fact be more than happy to do a decent-sized supermarket shop in one. However, I'm not really in favour of mandating them for various reasons, the main one being that it's far too easy to create stigma against those with genuine exemptions who can't wear a mask.
That said, a "mask-free hour" sounds like an utterly stupid idea. As
@Smidster said earlier, it sets a dangerous precedent - for example, should the train operators have a "noise nuisance hour" where anybody is allowed to be as unpleasantly loud as they wish? I don't think so.
The other problem is that if you say "you can go in without a mask, but you have to stick to social distancing" then people will start to completely disregard social distancing while wearing a mask, which gives the public the false idea that masks make them immune to spreading the disease. This will then increase cases in the population again and cause even more problems.