The Cheapest Supermarket for a Big Shop in the UK (2026 Compared)

Supermarkets fight hard for the “cheapest” crown — but which one actually wins for a big weekly shop? Here’s the cheapest supermarket for a big shop in the UK, based on independent price comparisons and real basket costs.

The verdict: Aldi and Lidl, by a clear margin

Every major comparison — Which?‘s monthly basket tracker, independent price studies — reaches the same conclusion: Aldi is the UK’s cheapest supermarket, with Lidl a whisker behind. For a typical big shop:

• Aldi: cheapest — often £10–£20 less than Tesco on a £100+ basket
• Lidl: second cheapest — within £1–£3 of Aldi typically
• Asda: cheapest of the traditional “big four”, but £5–£10 behind the discounters
• Tesco / Sainsbury’s / Morrisons: mid-range — competitive with loyalty pricing (Clubcard/Nectar) but rarely cheapest overall
• Iceland: competitive on frozen, less so for a full shop
• Waitrose / M&S / Ocado: premium — 20–40% more than Aldi for equivalent baskets

How much does switching save?

Moving a £150/week Tesco shop to Aldi typically saves £25–£40/week — that’s £1,300–£2,000/year. The saving comes from: lower base prices, minimal branded premium (own-brand is the default), and smaller stores that discourage impulse browsing (fewer aisles = fewer temptations).

The loyalty card factor

Tesco Clubcard and Sainsbury’s Nectar prices narrow the gap on specific items — sometimes beating Aldi on promoted lines. But across a full basket, the discounters still win. Strategy: do the main shop at Aldi/Lidl, and cherry-pick Clubcard/Nectar deals for branded items the discounters don’t carry well.

What the discounters do less well

Honest caveats:

• Range: ~2,000 lines vs ~30,000 at Tesco — if you need obscure ingredients, you’ll supplement elsewhere
• Branded goods: limited; brand-loyal shoppers may resist
• Online delivery: Aldi/Lidl don’t do full online grocery delivery (Aldi has limited Deliveroo trials)
• Fresh fish counters, extensive ready meals: thinner offerings
• Middle-aisle chaos: the famous “special buys” are brilliant or tat — no in-between

Tips for maximising the saving

1. Try the own-brand swaps blind. Family taste-test: own-brand vs branded for staples (pasta, tinned tomatoes, cereal, cheese). Most families can’t tell the difference on most items.
2. Shop the Super 6 / Pick of the Week — Aldi and Lidl’s weekly fruit/veg deals are genuinely excellent value.
3. Go with a list. Discounters’ middle aisles are designed for impulse buys — the list is your shield.
4. Check unit prices (the small print per 100g) — the biggest pack isn’t always cheapest.
5. Time it right: evening reductions on fresh meat and bakery.

What about quality?

The snobbery is outdated. Aldi and Lidl regularly win Which? taste tests and food awards — their own-brand products are often made by the same manufacturers as premium brands. The Which? supermarket satisfaction survey consistently ranks them top for value. Try it for a month before judging.

The bottom line

Aldi is the cheapest supermarket for a big UK shop, with Lidl a close second — switching from Tesco/Sainsbury’s saves most families £1,500–£2,000 a year. Use loyalty-card deals at the big four for branded top-ups, but make the discounter your main shop. For the full household budget picture, see weekly food shop costs for a family of four.

The hybrid strategy: how savvy shoppers actually do it

Almost nobody does 100% of their shopping at one supermarket — the real-world optimum is a hybrid. Main shop: Aldi or Lidl (70–80% of the basket — all the staples, fruit, veg, meat, dairy at the lowest prices). Top-up: Tesco/Sainsbury’s (branded items the discounters don’t do well, specific ingredients, Clubcard/Nectar deal-stacking). Online: whichever does the best delivery slot for the bulky/heavy stuff. Specialist: butcher/fishmonger for weekend meat (often better quality and value than supermarket premium ranges), market stalls for fruit/veg (late-day bargains).

The monthly rhythm: one big discounter shop weekly + one “big four” top-up fortnightly + market/butcher as convenient. Total time: barely more than single-supermarket shopping (the discounter shop is faster — smaller stores, fewer aisles). Total saving vs all-Tesco: £1,500–£2,500/year for a family. The people who save most aren’t loyal — they’re strategically disloyal.

Supermarket FAQs

Which is cheaper — Aldi or Lidl? Aldi, by a whisker — Which? basket comparisons usually put Aldi £1–£3 cheaper on a £100+ shop. But it varies week to week and basket to basket — they’re effectively tied, and both are £10–£20 cheaper than Tesco. Shop at whichever is nearer; the difference between them is noise, the difference to the big four is signal.

Are Clubcard/Nectar prices actually cheaper? On promoted items: yes, sometimes dramatically (£3.50 vs £5 for branded goods). Across a full basket: no — the discounters still win overall. Strategy: check the loyalty app before shopping, buy the promoted brands you’d buy anyway, do everything else at Aldi/Lidl. Never buy something because it’s on Clubcard offer — that’s how loyalty schemes make their money back.