Love the colour.
Find it elsewhere.

Many merchants will put a colour name into their mixing machine, but the result depends on the base paint and tinters they use. Farrow & Ball builds its colours with a high level of pigment, so a computer match can look flatter or shift in different light. A named colour from another maker, chosen by eye against the real card, is usually the more reliable route.

Each match is scored with CIEDE2000, the standard measure of how different two colours look. Under 1 is near identical, under 2 is very close, under 3.5 is close. The colour values come from published colour libraries and describe how each colour looks on screen, so always paint a sample before you commit.

Light changes everything. A north facing room in Fife pulls colours cooler and greyer. Sheen matters too: a flat emulsion and an eggshell in the same colour read differently. Paint a sample board at least A4 size, move it around the room and look at it morning and evening.

Not always. What you pay for in a good paint is pigment, coverage and how it wears. A close colour in a durable trade paint can outlast a premium flat emulsion in a hallway. Pick the colour first, then pick the product for the surface.