Nipping to your Sainsbury's Local or Tesco Express can be a godsend when you've run out of milk or need a quick worknight dinner. But new research has revealed that shoppers could be paying a lot for this convenience. 

In fact, smaller local branches of supermarkets are charging as much as 23% more for products than at the same supermarket's larger out of town shops. 

This price inflation could be gradually pushing up the price of all our food shopping as some big supermarket increasingly open mini supermarkets and close their out-of-town stores, leaving us with little choice but to pay more for our shopping.

For example, Sainsbury’s has doubled the number of Sainsbury’s Local stores in just five years to 800, while Little Waitrose has grown from zero to 64 outlets in 10 years.

How prices vary

The supermarkets defend the move by saying the way we shop is changing with more of us preferring to shop little and often rather than heading to a big store for a weekly shop.

But how is it affecting the price of your shopping basket?

Hit your local Tesco Express rather than a big Tesco supermarket and you should expect to pay around 10% more for your shopping, according to research carried out by the Daily Mail.

If you regularly pop into an M&S Simply Food on your way to work, you may want to do your wallet a favour and stop.

The chain charges a whopping 23.3% more for a small carton of fresh orange at an M&S Simply Food than at one of its Food Halls.

Take a look at a selection of price differences across the big supermarket brands, as highlighted by the Mail:

Sainsbury’s

Product

Price at Sainsbury’s Local

Price at Sainsbury’s supermarket

Price difference

Butcher’s Choice 8 British Pork Sausages

£1.75

£1.50

16.7%

Hovis Granary 800g loaf of bread

£1.65

£1.45

13.8%

Heinz Baked Beanz 415g

85p

75p

13.3%

Red Leicester cheese 250g

£2.00

£1.70

17.6%

Sweet and crisp apple juice 1 litre

£1.35

£1.15

17.4%

Green Giant Original sweetcorn 198g

75p

65p

15.4%

Caesar dressing 180ml

£1.45

£1.25

16%

 

M&S

Product

Price at M&S Simply Food

Price at M&S Food Hall

Price difference

Freshly squeezed orange juice 300ml

£1.85

£1.50

23.3%

Strawberry jelly trifle 450g

£2.90

£2.50

16%

Baracca & Fassoldi Chianti 75cl

£14

£12

16.7%

Sauvignon Blanc Gold Label 75cl

£9.55

£8.50

12.3%

Large free range eggs 6

£2.20

£2.00

10%

Jelly Babies 225g

£1.30

£1.15

13%

Wasabi peas 50g

£1.45

£1.20

20.8%

Gin & Tonic single can 25cl

£2.25

£2.00

12.5%

[Read more: Beware of these sneaky supermarket price rises]

Tesco

Product

Price at Tesco Express

Price at Tesco supermarket

Price difference

Calpol 6+ suspension 80ml

£3.30

£3.00

10%

Tesco fusilli pasta 500g

65p

59p

10.2%

Weetos 500g

£2.95

£2.65

11.3%

St Agur Blue cheese 150g

£2.20

£2.00

10%

Pilgrim’s Choice Extra Mature Cheddar 350g

£3.30

£3.00

10%

Coke Zero 8x330ml

£3.85

£3.50

10%

Red Bull energy drink, 4x250ml

£4.39

£3.99

10%

 

Waitrose

Product

Price at Little Waitrose

Price at Waitrose supermarket

Price difference

Waitrose Babyleaf herb salad 100g

£2.20

£2.00

10%

Tabasco sauce 57ml

£2.09

£1.89

10.6%

Tinned chopped tomatoes with garlic and olive oil 400g

72p

65p

10.8%

Heinz Baked Beanz 150g

61p

55p

10.9%

Love Life green lentils 500g

£1.32

£1.20

10%

Waitrose Essential vegetable oil 1 litre

£1.42

£1.29

10.1%

Groundnut oil 500ml

£2.19

£1.99

10.1%