I don't know about top 5 favourites but most visited probably Sainsbury's, Lidl, Morrisons, Tesco, Aldi in that order. Iceland when there was one (became a larger Lidl store). I predominantly went to Lidl and Savers at uni (just once to M&S haha, a small shop).M&S food hall is very nice and all, especially around Christmas, but not a go-to throughout the year.
Asda and Waitrose are the ones I've hardly been to
Also I remember and quite liked Netto
Of the German two, more Aldi recently; Lidl has gone downhill, including the bakery. I did go to Lidl most during my time in uni. I miss when it felt more like a cosy local store.

Morrisons is hit and miss with the warm food. Also Sainsbury's used to do really nice chicken and pizza when it had a café (before the Argos and Starbucks stores joined; the latter I've never purchased from).
Pak Foods and Wing Lee are considered UK supermarkets; ages since I've been inside those two specifically. They're good overall, the Asian and ethnic/world food stores.
