v3ct0rstock engineFictional demo

Your prices

Five prices worth a look

Lines where the till suggests the shelf price is leaving money behind, and what happened after the last rises. Suggestions only: check the product and pack, then decide.

Invented price examplesFerry Lane · week of 24 August 2026

Prices to change next

5 lines · recommendations, never automatic
ProductPrice nowSuggestedWhat the till says
Fizzy cola 2L£1.85£2.0934 a week; held since last autumn
White sliced loaf£1.15£1.2568 a week; held since January
Semi-skimmed milk 2pt£1.30£1.3552 a week; cost rose in July
Milk chocolate bar£0.85£0.9541 a week; margin thinnest of the five
Kitchen roll 2pk£1.99£2.2912 a week; cost up 9% since spring

Together worth about £1,314 extra a year before VAT if shoppers keep buying at today's volumes. That is the assumption to test, which is what the results below are for.

How that is worked out: each uplift times this week's units, added up, times 52. 24p × 34 = £8.16, plus 10p × 68 = £6.80, plus 5p × 52 = £2.60, plus 10p × 41 = £4.10, plus 30p × 12 = £3.60. That is £25.26 a week, so £1,313.52 a year, rounded to £1,314.

After VAT it is about £1,176 a year. The loaf and the milk are zero-rated, so all £9.40 a week of their uplift stays with you. The cola, the chocolate and the kitchen roll are standard-rated, so their £15.86 a week becomes £13.22 once VAT comes off. £9.40 + £13.22 = £22.62 a week, so £1,176 a year.

Results: did the last rises stick?

Read at the till, four weeks after each change
ProductChangedPriceUnits a weekVerdict
Energy drink 500ml5 Aug£1.49 → £1.6541 → 39Stuck · margin up £6 a week
Crisps grab bag5 Aug£1.00 → £1.1058 → 57Stuck · margin up £6 a week
Toilet tissue 4pk22 Jul£2.49 → £2.7922 → 21Stuck · margin up £6 a week
Ice cream tub22 Jul£3.50 → £3.9519 → 14Watch · units fell, margin flat

Three of four rises stuck: units held within normal week-to-week movement and the margin gain stayed. The ice cream tub is giving the rise back through lost units; worth a look before the next change.

How "margin up £X a week" is worked out: the uplift times the units still selling each week, before VAT is taken off. Energy drink 16p × 39 = £6. Crisps 10p × 57 = £6. Toilet tissue 30p × 21 = £6. These four lines are all standard-rated, so about a sixth of each figure is VAT.

Why the ice cream tub reads flat. That row nets off the units it lost. 45p × 14 units still selling = £6 gained, less the 5 units no longer selling at about £1.25 of margin each = £6.25 given back. The two cancel out, so the margin is flat while the units are down.

Inside the software

See the actual product

Open the real software exactly as an owner sees it each morning, with invented figures.

The worked examples on this demo site and the product pages use separate invented snapshots, so their dates and totals differ.

Review each product yourself. Nothing here changes a price automatically.