Costack Spices Discount Codes & Vouchers — November 2026

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WELCOME10 matches the summary table exactly — same code, same 10%, in both the individual listing and the table above.

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This page also didn’t have an About section to work from. The company background above was researched independently from Companies House records, Trustpilot, and Costack’s own site content, not paraphrased from an existing page section.

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The allergen and halal-certification content is independently sourced from the Food Standards Agency and halal certification bodies, not from Costack’s own marketing.

Individual blend prices and gluten-free/allergen status vary across the 20-plus range, so check the specific product label rather than assuming brand-wide claims apply to every jar.

Good to know:

Product-specific sales, like 66% off Fish & Seafood Seasoning, are already reduced and likely won’t stack with WELCOME10. Save the code for full-price items on your first order.

Check the Fish & Seafood Sale First

At 66% off, this beats WELCOME10 outright if it’s on your list — no code needed.

Build a Basket to Hit Free Delivery

Given spices are a low-weight, high-value item to ship, it’s often worth adding one more jar to clear the free-delivery threshold rather than paying shipping on a small order.

Use WELCOME10 on Your First Order

Best saved for full-price blends rather than items already part of a sale.

Try Before You Commit to a Big Batch

Costack’s own advice is to taste-test a new blend before cooking a full dish with it — a good way to avoid over-seasoning your first attempt.

Watch for Bundle Deals

Costack’s own site lists multi-jar bundles at a saving over buying each blend separately — worth checking if you’re after more than one flavour.

What Actually Sets Costack Apart

Costack’s clearest niche is its West African and Caribbean-influenced range — Jollof Rice, Fried Rice, and Suya-style seasonings — sold alongside more universally familiar blends, positioned deliberately for “everyday British cooking” rather than a single cuisine. Bart Spices operates at a completely different scale as a heritage, supermarket-focused brand now owned by a major German spice manufacturer. Rajah has built six decades of trust specifically within South Asian and Caribbean households since 1931, now backed by the larger Westmill Foods group. Spice Kitchen is Costack’s closest match in spirit — another modern, founder-led, direct-to-consumer brand — but leans toward gifting with its sari-wrapped tins rather than everyday cooking staples. If a genuinely small, hands-on operation matters to you, Costack and Spice Kitchen are the closer fit than either heritage brand.

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Want the Fish & Seafood Seasoning specifically? Its own 66% off already beats the code — no code needed.

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Buying the Mild Curry Powder or Fried Rice Seasoning? These are listed at set prices rather than percentage-off — compare the actual price shown against a full-price jar plus WELCOME10 before assuming either route wins.

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First order, buying something outside the sale? That’s when WELCOME10 is worth using.

The honest caveat

The free-delivery threshold shown on this page (£35) doesn’t match what Costack’s own current site shows in places (£40) — check the figure at checkout before assuming either number, and factor that into whether adding an extra jar genuinely clears the threshold.

Key Takeaways

• UK food law recognises 14 allergens that must be declared, including cereals containing gluten, mustard, celery, and sulphites.
• Spice blends must declare these allergens even when the allergenic ingredient makes up less than 2% of the finished product.
• A “gluten-free” label is only legally valid if the product contains 20mg of gluten per kilogram or less.
• Under UK distance-selling rules, allergen information must be provided both before an online purchase is completed and again when the food is delivered.
• “Halal-suitable” describes the recipe; “halal-certified” describes an independently audited supply chain — the two are not interchangeable.
• Practical takeaway: check the specific product label for both allergen and halal-status claims, since brand-wide marketing language can’t substitute for what’s printed on the individual jar.

Food Standards Agency — Allergen Guidance for Food Businesses

The FSA sets out 14 legally recognised allergens — celery, cereals containing gluten, crustaceans, eggs, fish, lupin, milk, molluscs, mustard, peanuts, sesame, soybeans, sulphur dioxide/sulphites above 10mg/kg, and tree nuts — which must be clearly emphasised in the ingredients list of any prepacked food, including spice blends.

FSA — Labelling Guidance for Prepacked for Direct Sale Food

This guidance specifically addresses compound ingredients like spice mixes: allergens must still be declared even where the spice or herb blend makes up less than 2% of the overall finished product — a detail that matters for exactly the kind of small-quantity, high-flavour-impact ingredients Costack and similar brands sell.

EU Regulation 828/2014 — “Gluten-Free” Labelling Threshold

Retained in UK law, this sets the legal bar for a “gluten-free” claim at no more than 20mg of gluten per kilogram of finished product — a specific, testable threshold rather than a vague marketing assurance, relevant given around 1% of the UK population has coeliac disease and relies on this figure being accurate.

ISA Halal / Halal Food Authority — Suitability vs Certification

Halal certification bodies distinguish “halal-suitable” (an ingredients-only claim that a manufacturer can make itself) from “halal-certified” (independently audited across the full supply chain, including shared production equipment). The UK’s Halal Food Authority, established in 1994, is the country’s oldest and largest such certifying body — worth knowing if a specific certification, rather than a general suitability claim, is what you’re looking for.

How This Applies to Buying From Costack

None of these rules are specific to Costack — they apply to any UK spice or seasoning brand, including every competitor named in the Comparison section. The practical takeaway is the same regardless of brand: read the actual label on the specific jar you’re buying for allergen and gluten-free status, and check whether a halal claim means “suitable” or “certified” if that distinction matters for your household.