ChatGPT described my & DD's food shop to a T - I'm impressed. We buy & eat what it suggests already - int he mid/comfortable range:
For 1 adult + 1 teenager in the UK, eating mostly fresh, minimally processed food (avoiding ultra-processed foods/UPFs), a reasonable grocery budget is approximately:
Budget levelWeeklyMonthlyWhat it looks like
Very frugal
£60–£75 pw
£260–£325 pcm
Mostly home cooking, seasonal vegetables, beans, oats, eggs, some chicken, very little food waste.
Comfortable (recommended)
£80–£110 pw
£350–£480 pcm
Plenty of fresh fruit and vegetables, good-quality protein, fish once a week, nuts, yoghurt, wholegrains, occasional treats.
Premium
£120–£160+
£520–£700+
Organic produce, higher-quality meat and fish, speciality items, more berries, convenience without UPFs.
For most households, £90-100 per week is a realistic target for eating well while avoiding UPFs, provided you cook most meals from scratch. UK government data show average household food spending per person is lower overall, but that includes cheaper processed foods and eating patterns that may not match a fresh-food diet.
Example £95/week shop
Fruit: £12
Vegetables & salad: £18
Potatoes, rice, pasta, oats: £10
Milk & yoghurt: £8
Eggs: £5
Chicken, fish, mince, beans, lentils: £22
Bread: £4
Cheese: £6
Nuts & seeds: £5
Herbs, spices, olive oil and extras: £5
Ways to keep costs down without relying on UPFs
Shop mainly at Aldi or Lidl for fresh produce.
Buy frozen vegetables and berries—they're nutritious and often cheaper.
Use beans and lentils to replace some meat.
Buy whole chickens instead of breast fillets.
Plan meals around seasonal vegetables.
Batch cook soups, curries, chilli, casseroles and pasta sauces.
Reduce food waste by freezing leftovers.
If your aim is excellent nutrition rather than just low cost, I'd suggest budgeting around £400 per month (£90–100/week) for one adult and one teenager. That should allow a varied diet with plenty of fresh produce, quality protein, and very little reliance on ultra-processed foods, while remaining achievable at mainstream UK supermarkets. Recent reports also note that healthier diets have become relatively more expensive as food prices have risen.