> The one kind of physical shop I really miss is the kind of place where you can buy one screw, nail or picture hook etc.

So much nostalgia for these shops. A man with a posh, sparkling clean apron knowing exactly what you need or mean. In and out in under a minute or two having parted with just 30p

Screwfix are actually pretty close in terms of service. Their staff are pretty patient with people and quite helpful. They mostly only sell packs of things though (and wow fixings got expensive... anyway. And it's ironic that the "trades" brand of the group that owns B&Q has better customer service than B&Q...)