Sorry to hear about your son Janet, based on the Southern UK experience it feel like shopping got better suddenly quickly.
Many of our stores are talking about lifting buying limits on most items or opening more normal hours.
Yea there's the odd daily shortage, like today was no eggs at all, but that could be down to a broken delivery lorry.
Really the only problem I've encountered is with 1 major UK supermarket and their "no couples together" policy.
Especially if certain staff on the door decide to engage jobsworth mode in regard to disability.
Our national media has reported that a blind person couldn't shop. While no issue with their dog, their helper wasn't allowed.
Staff where told not to help either. Locally, I've seen that shop reject:
Someone in a manual wheelchair, which needed pushing.
The person could only go alone if they could transfer to one of the stores electric chairs, and none where working.
A young single mum with an autistic kid. Told to leave him outside.
Personally, like many carers in similar social/support roles or those who work in elderly care, I've also experienced many similar problems.
Almost daily we go to that shop, which for geographical, support, cost etc, isn't somewhere we can stop going to.
That usually leads to the person we're looking after getting really upset. With feelings and behaviours can last several hours.
So, like many such carers do now, I've resorted to "sneaking" in with folks that need help.
A number of folks that's considerably increased as all formal forms of support have understandably stopped, replaced with some amazing volunteers.
Which is where I think a consistent set of rules could be useful, rules that are equally applied across all shops.
What kinda things are deemed essential, what access conditions are there for disabilty's etc.