There's no consistency about bike parking.
Here in Taunton we have:
A Tesco supermarket with stands in an inconvenient and out-of sight place, attached to the ground, but wit bolts sticking up so the nuts could be removed with a socket set in seconds. I've never seen more than a couple of bikes (but don't use the store much)
Asda with no bike racks. Bikes get locked to the railings though, so you'd think they'd realise there's demand - you'd be wrong.
Lidl. No racks, nowhere to lock bikes to except the rails around the trolleys.
Lidl and Aldi in town - I haven't found dedicated racks but there are council ones nearby which are usually full.
Sainsbury's have 2 stores. One big one on the outskirts of town. It has wheelbenders which are lightly used, and many more cycling customers (including me) who use various railings and the anti-trolley guards around various pillars. At the smaller town centre store there are Sheffield stands, shared with Blockbuster. They are always full to overflowing.
Morrisons have Sheffield stands at their supermarket, but not enough. they are nearly always full up so cyclists have to use all sorts of railings and barriers.
That's just the big ones.
Many of the cycling shoppers use panniers, baskets, saddlebags and so on, and the amounts being spent are considerable. Where there are good and well placed cycle stands they are full, so the stores which have them must be benefiting financially. The failure to provide good cycle parking just doesn't make commercial sense. I'm a light shopper and I often have £50 worth of shopping on my bike. Other cyclists have family shopping and I've seen £100 at the till being loaded onto a bike, several times, at Morrisons.
At least here there are council cycle stands in the town - well installed and wel distributed. Just about enough for demand on a cold wet and windy day in winter.