How are my savings calculated?

Savings are based on a 10% benchmark reduction applied to your monthly spend, adjusted for household size and your local ONS food price region. Larger households and those in higher-cost regions have more swap potential.

Why does my region affect the results?

Food prices vary across the UK. Your postcode is looked up via Postcodes.io to set the regional price baseline. London runs around 30% above the UK average; the Midlands and North tend to run slightly below.

Are these swaps available at all supermarkets?

The swaps are based on product categories available at all major UK supermarkets (Tesco, Sainsbury’s, ASDA, Morrisons, Lidl, Aldi). Own-brand alternatives exist at every one of them.

Can I filter by dietary requirements?

Yes — use the Vegetarian, Vegan, and Gluten-free filter buttons that appear above the swap list after running the tool. Selecting a filter shows only swaps that match that requirement.

How often should I re-run this tool?

Quarterly is a good rule of thumb. Seasonal produce availability changes and supermarket pricing shifts mean a fresh run every 3 months can surface new savings opportunities.

What is the live food inflation figure shown on the savings card?

The tool pulls the latest ONS Consumer Prices Index for food and non-alcoholic beverages (series L522) via /api/economy/inflation. We compare your projected savings rate against this year-on-year figure so you can see whether your plan outpaces real food price rises.

Grocery Smart-Swap Planner UK · Cut Weekly Food Bill

How This Tool Works

📋 Purpose

Compare own-brand vs branded swaps and seasonal produce alternatives to see how much you could save each month, based on your postcode and household size.

⚙️ How It Works

1
Enter your postcode and monthly grocery spend
2
See personalised swap recommendations by category
3
Download your swap plan and act on the highest-saving swaps first

Your Postcode

Monthly Grocery Spend

Household Size

👫 Perfect for couples - optimized for standard portions

How far ahead are you planning?

Choose how long you want to project your savings for.

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Grocery Basket Smart — Complete Guide

Use this guide to get the most accurate results from the Grocery Basket Smart Swap Planner and understand the methodology behind your savings estimate.

📅 Last updated: 2026-03-20

Quick Tips

Jump-start your understanding with these essential tips

The most accurate results come from using your real grocery spend. Check your bank statement for the last 2–3 months and use the average. Guessing high or low shifts all the swap estimates proportionally.

After running the tool, use the filter buttons (Vegetarian, Vegan, Gluten-free) to show only swaps that work for your household. This removes irrelevant suggestions and focuses the savings on what you can actually act on.

The swap list is ordered by monthly saving. The top 2–3 swaps typically account for over 60% of the total saving. Focus there first rather than trying to change everything at once.

Step-by-Step Guide

Follow these steps to get the most from this tool

Your postcode is used to set the right regional price baseline — food costs vary significantly across the UK, with London running around 30% above the national average. Enter your typical monthly spend on groceries, not just one week’s shop. If unsure, check your bank statement and average over 2–3 months.

💡 Pro Tips:

•Include both supermarket and convenience store spending.
•If you use multiple supermarkets, combine the totals.
•A rough estimate is fine — you can re-run with an exact figure later.

The tool shows up to 7 swaps across produce, protein, dairy, and pantry categories. Each swap shows the monthly and annual saving, a confidence level, and dietary tags. Expand any swap to see a nutrition comparison so you can check the switch is nutritionally equivalent before making it.

💡 Pro Tips:

•High confidence = well-established price differential at major UK supermarkets.
•Medium / Estimated = directional guidance; check your local store before committing.
•Use the dietary filters if any swaps include items you don’t eat.

Use the CSV download to save your swap plan. The next time you shop, pick one or two top swaps to try. After a month, re-run the tool to see if the savings matched. Swap habits compound over time — a single £30/month saving becomes £360/year without any further effort.

💡 Pro Tips:

•Re-run quarterly as seasonal produce availability changes.
•If your spend changes significantly, update the monthly figure and re-run.
•The planning horizon selector lets you project savings over 3, 6, or 12 months.

Advanced Topics

Deep dives for advanced users

Own-brand (store-brand) products at UK supermarkets are typically 20–40% cheaper than their branded equivalents, with near-identical ingredients. The biggest differentials are in cereals, pasta, dairy, and tinned goods. Fresh produce swaps (e.g. seasonal UK fruit vs imported) follow a different dynamic — they depend on harvest cycles and import costs, so savings vary by season.

The tool uses Postcodes.io to look up your region and applies an ONS food price multiplier. London postcodes attract a 1.3× multiplier (30% above UK average). South East, South West, and East of England are at 1.05×. All other regions use 0.92×. This multiplier adjusts the baseline spend but not the swap proportions — the category split and swap allocation ratios are the same regardless of region.

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