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I often then paint the whole wall with the close match, it's rare that you will be able to patch with a scanned colour.
Another tip is use a small roller if the walls are rolled, paint brush otherwise. You can paint an entire wall in minutes with a small roller. Patches first then 1 coat on the whole thing.
Unless you fill screw holes carefully, wipe the excess off with a cloth then dab in a tiny amount of fresh paint of a close match. That would probably get past most exit inspections.
Airhead
If you can somehow remove a sample then B&Q can analyse it instore and make you a Valspar mix.