The Successful Shopper.

Anybody who uses a one stop shop for their weekly purchases - namely, any large supermarket - is going to pay a huge premium for that minor convenience.
Does that person even recognise a bargain? How can one so do without a point of comparison?
Unless you are on a huge income, such shopping is silly in the extreme.

If I may describe how I shop - I do so principally out of concern for readers and a desire for shoppers to force down shop prices. Please do not take this as a conceit on my part. If you already shop well - then my most humble apologies.
I generally avoid shopping at: Marks & Spencer, Sainsburys and Tesco - as these are the three most expensive in my area, although that is not to say that bargains may not be found to better my 'normal' shops on occasion.
The key is to memorise prices of all that you buy - you will be surprised how easy this is as you will already be aware of many before you start.
I tend to make one major supermarket my weekly target - and most weeks that is Morrisons. My visits last no longer than 25 minutes allowing me to pick up items which I know to be the cheapest and also to avail myself of the bogofs and special offers for which Morrisons is arguably the best. I often swing by either Aldi or Lidls to supplement the shop and tend to be home within the hour.
Whenever passing: Iceland, B&Ms, Home Bargains and assorted pound shops - I go in and take their bargains.
It sounds like a lot of messing about but probably averages a shopping total of no more than 5 hours a month. Careful organisation of journeys is necessary so as to waste neither time nor petrol but it soon becomes a way of life - and hitting any bargain is always a deep joy.
I have long been on a low income but the house I own in Spain came about purely from these kind of savings invested when I was a young man.
Today - they help pay for decent holidays and keep my car new.
Too much bother? - Are you sure?