Some 51% of Britons no longer do a big shop for groceries each week but instead shop as and when they need supplies - but this is a trend that is proving costly.
The average cost of a weekly grocery shop is £86.52, according to a poll by VoucherCodesPro.co.uk, while shopping on a more casual basis works out around £115.64 a week.
This means that those who do a big shop each week will save £29.12 a week or £1,514.24 a year.
Nearly half (45%) of those who didn't do a big shop admitted they 'probably didn't get the best deals' on their groceries either because they went to local convenience stores that were usually pricier than supermarkets or because they didn't shop around for the best deals.
Three-quarters of those who now buy groceries as and when they need them used to do a big shop. Nearly half (49%) cited 'lack of time' as the main reason for changing their shopping habits, 26% admitted they 'can't be bothered' with a weekly shop, while 17% said they simply prefer shopping more often.
Click and collect
George Charles of VoucherCodesPro.co.uk said: "Although the weekly shop can feel like a big chore when it's time to head to the supermarket, people end up saving themselves money in the long run by doing this.
"Popping in to your local shops as and when you need items is very time consuming and also ends up being expensive. There tends to be better deals to be had in supermarkets and it's much better to know the cupboards are stocked at home than to realise you have to head out again to get the ingredients for tea."
He added: "If people cannot be bothered to do the weekly shop, they should consider new click and collect services that supermarkets such as Tesco are offering to shoppers, or they could order their items online for delivery."
Find out how you could cut your grocery bill in half with expert tips from our columnist Miss Thrifty