what time do supermakerts reduce ?

it varies from store to store, but usually depends on what time the shop closes, or when it starts to get a bit slow instore

My local Sainsburys tends to reduce from about 6pm on a weekday, Somerfield from about 3pm, and Tesco seems to be continually reducing throughout the day

Flea

I normally get good bargains from Morrisons if I go in after work (About 5.30 by the time I get there) I will usually find reduced fish, bread and some kind of cakey-goodness. They do some great reductions on Sunday afternoons too - joints of meat for 99p if you're lucky

In my 24 hour Tesco, I have found good things about 7-8pm but it does vary.

Best advice would be to do random "drop ins" and see how you get on.

If you have an M&S near you, good bargain hunting is to be found about 2 hours before closing on a Sunday at least.