Word reaches me on the grapevine from up north that local bargain paradise Jack Fultons has been bought out by Poundland, which probably means no more esoteric bargains as enjoyed during my Leeds days, like three litres of chocolate Alpro for a quid etc. I think Heron Foods is still about which was the next best thing, but nowhere near the randomness.
I think the proliferation of these types of shops in Yorkshire was due to the large number of food manufacturing places in the region like Arla (south Leeds) and places in East Yorkshire/Lincs, a lot of surplus and secondary stock passed through these sort of shops or through stalls in Leeds indoor market, often branded for overseas. Nothing like it down south.