It is not one seller basket
The default arithmetic joins two maker paint references with a Jackson’s paper reference. Those are separate selling routes. The total£50.55 does not establish a single eligible order at either merchant. The set is also sold out on the latest maker product page.
Threshold wording differs
The opened maker Ultramarine family page advertises a£59 free-delivery threshold, while the set page shows£45. Jackson’s advertises a separate£50 threshold with conditions. These observations are kept as source-version differences, not silently reconciled into one universal free-shipping rule.
A practical purchase check
If ordering the tube and set from the maker, their default merchandise reference is£32.65. The paper’s£17.90 is another order. Check each genuine basket and destination rather than adding a product from a different seller to reach a displayed threshold. A dispatch estimate is not an arrival guarantee.
Next action
Enter actual confirmed delivery and additional charges in the ledger. Blank charges leave the full total unresolved. No code, promotion, stock reservation or returns entitlement is invented, and the site submits no order or address information to sellers.
Sources & scope
Checked November 5, 2026. Manufacturer and retailer references support the specific statements. Dated displayed prices are not final checkout quotes, performance rankings or performance testing. This shopping reference does not replace the exact product label or retailer instructions. Current received labels and independent art-material/chemical/content/commerce review remain pending.