Not a single supermarket delivery available for a fortnight here. Click and collect a bit thin on the ground too. What is wrong with people? No one ran out of food in March, the supermarkets didn't close. Are these restrictions responsible for some sort of collective madness?
I think people are preparing for the prospect of having to isolate for 14 days. Plus those who have returned to work are now being asked to work from home again if possible. Naturally if you spend more time at home, you need more supplies - lunches, tea/coffee and more bog roll. This multiplies if your kids are also at home. I don't think anything is 'wrong with people' really; the good are for sale, the delivery slots are on offer so people buy/book them.
Personally I would normally start to stock up on non-perishables at this time of year anyway, in case of bad weather over winter. And this year we also have the threat of Brexit causing even more chaos to supply chains.
I've not had a problem booking a delivery though. The thing is, the supermarket are making the situation worse. I could go about 10 days between deliveries, but I have a saver pass which gives me weekly free deliveries on Tuesdays, Wednesdays and Thursdays, which kind of forces me into a 7 day cycle (too short) or a 14 day cycle (too long).
I've also, in the last couple of weeks, had coupons from two supermarket chains through the post. One offered £4 of a £20 spend (six coupons provided) and the other £6 off a £30 spend. If people are receiving these types of offer, they may well be adding extra non perishables to get to the minimum spend.
Last time, people who followed the instructions to only buy what they needed were hardest hit; if they had to isolate they didn't have enough stock in, and at that point couldn't go out and couldn't get deliveries. So I can see why people are being cautious this time. It is clear that the government haven't really done a lot of preparation for the problems this winter could cause so as individuals we have to do our own preparation. This doesn't mean filling the attic with loo roll, but everyone buying an extra pack for the reasons above soon adds up.