40-YEAR STARTER IN EVERY LOAF

Signature Sourdough

The award-winning Celtic Bakers Signature organic sourdough range is hand-crafted at our bakery in North London

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Four loaves of bread with a rustic, cracked crust in a plastic crate at a bakery or store.

Real Bread Can’t Be Rushed

The art of making a great sourdough loaf begins with three simple ingredients: flour, water, and salt. That's it! We use traditional baking methods to ensure our bread has nothing in it that doesn’t need to be there.

The famous sourdough “kick” (the tangy, intense flavour) comes from the starter culture, a natural mix of flour and water, which yields yeast to give the bread its rise, along with wild bacteria to impart flavour, texture, and aroma. One of our starters has been going for 40 years! We give our dough all the time it needs to cold-ferment overnight, ensuring a well-balanced flavour, before baking it on the stone floor of our oven to develop the perfect crust.

Our organic signature sourdoughs are pre-sliced and bagged for convenience, making them ideal for freezing at home and giving you the best toast whenever you need it.

If you want to know more about the science behind sourdough, we recommend visiting the Real Bread Campaign’s page on sourdough, where the process and health benefits of this ancient, 100% natural bread-making method are fully explained.

A clear plastic bag of organic white sourdough bread from Celtic Bakers on a white marble surface with a plain grey background, featuring a Great Taste 2026 award badge in the upper left corner.
A clear plastic bag of organic white sourdough bread from Celtic Bakers on a white marble surface with a plain grey background, featuring a Great Taste 2026 award badge in the upper left corner.

White Sourdough

Our signature White Sourdough gives you that classic tangy taste, with a chewy texture and a perfect crust. Hands down, the best toast you'll ever have, we promise. 

    • INGREDIENTS: Fortified wheat flour ( wheat flour, calcium carbonate, iron , niacin, thiamine), water, rye flour, salt , wholemeal wheat flour. *Organically produced ingredients 

    • ALLERGENS: Gluten

Soil Association Organic Standard Real Bread
Clear plastic bag of Celtic Bakers organic Vermont sourdough bread, with a beige label, placed on a marble surface against a gray wall.
Clear plastic bag of Celtic Bakers organic Vermont sourdough bread, with a beige label, placed on a marble surface against a gray wall.

Vermont Sourdough

Our Vermont Sourdough captures the irresistible combination of a white bread with added rye - bringing with it fibre, extra moisture in the dough and strength to the taste.

    • INGREDIENTS: Fortified wheat flour ( wheat flour, calcium carbonate, iron , niacin, thiamine), water, rye flour, salt , wholemeal wheat flour. *Organically produced ingredients 

    • ALLERGENS: Gluten

Soil Association Organic Standard Real Bread
A bag of Organic Multiseed Sourdough bread from Celtic Bakers, featuring a Great Taste 2026 award badge on the top left corner.
A bag of Organic Multiseed Sourdough bread from Celtic Bakers, featuring a Great Taste 2026 award badge on the top left corner.

Multiseed Sourdough

Our Multiseed Sourdough is made with blends of sunflower, linseed and pumpkin seeds. It has a rich, nutty flavour and an aromatic crust.

    • INGREDIENTS: Water, white wheat flour* (wheat flour* fortified calcium carbonate, iron, niacin, thiamine), three malts and sunflower flour* ((white wheat flour (fortified with calcium carbonate, nicotinamide, iron, thiamine), wholemeal wheat flour*, malted wheat flakes* (6%), sunflower seeds* (3.5%), malted barley flour*, brown linseed* (1%), golden linseed* (1%), malted rye grains (1%), pumpkin seeds*(1%)), rye flour*, salt, wholemeal rye flour*, wholemeal wheat flour*, malted barley*.

    • ALLERGENS: Gluten

Soil Association Organic Standard Real Bread
Bag of Celtic Bakers organic spelt sourdough bread on a white marble surface.
Bag of Celtic Bakers organic spelt sourdough bread on a white marble surface.

Spelt Sourdough

Our spelt flour comes exclusively from Shipton Mill. This famous ancient grain is known for its nutty flavour and gut health benefits.

    • INGREDIENTS: White spelt (wheat) flour*, water, wholemeal spelt (wheat) flour*, salt.

    • ALLERGENS: Gluten

Soil Association Organic Standard Real Bread
Package of Celtic Bakers organic olive sourdough bread in clear plastic bag with green label and black text, placed on a white marble surface with a gray wall background.
Package of Celtic Bakers organic olive sourdough bread in clear plastic bag with green label and black text, placed on a white marble surface with a gray wall background.

Olive Sourdough

A blend of kalamata and green olives in our signature organic cold-fermented sourdough - taking your taste buds on a Mediterranean adventure!

    • INGREDIENTS: White wheat flour* (wheat flour* fortified calcium carbonate, iron, niacin, thiamine), water, pitted Kalamon olives* (6%)(pitted Kalamon olives*, water, sea salt, red wine vinegar*, extra virgin olive oil*), pitted green olives* (6%) (green olives*, water, sea salt, extra virgin olive oil*, lactic acid, citric acid), rye flour*, wholemeal rye flour*, salt, extra virgin olive oil*, malted barley*, wholemeal wheat flour*, herbs Provençale* (oregano*, marjoram*, basil*, rosemary*, thyme*).

    • ALLERGENS: Gluten

Soil Association Organic Standard Real Bread
A loaf of white sourdough bread in transparent packaging from Celtic Bakers, sitting on a white marble surface with a light gray background.
A loaf of white sourdough bread in transparent packaging from Celtic Bakers, sitting on a white marble surface with a light gray background.

Baked in a tin, more like a classic farmhouse-style loaf, this 500g sourdough has a closer structure, retaining moisture for slightly longer. Sliced whole, each slice is much the same shape and size.

White Tinned Sourdough

    • INGREDIENTS: Fortified wheat flour ( wheat flour, calcium carbonate, iron , niacin, thiamine), water, rye flour, salt , wholemeal wheat flour.*Organically produced ingredients

    • ALLERGENS: Gluten

Soil Association Organic Standard Real Bread

FLOUR FORITFICATION

In the UK, white and brown flours are required by law to have extra vitamins and minerals (like iron, calcium and -from 2026- folic acid) added to them.

Looking for something a little more traditional? Give our Spelt loaf a try. Because spelt is an ancient grain, it falls outside these rules - meaning zero added nutrients, just 100% natural grain.

WHAT OUR CUSTOMERS THINK:

TESTIMONIALS

"Flavour, texture, ingredients, defrosts well retaining full flavour. Love this bread!"
Ocado AranE
"Oh my word! This bread is absolutely delicious."
Abel & Cole Anonymous
"It is the best sourdough I’ve had and I’ve tried a lot. Perfect crust and chewiness with a lovely flavour"
Sainsburys DpLa

Where to buy…

You can find our Signature Sourdoughs in selected retailers across the UK