Long Acre No.102 from Mylands is a blue-grey — composed, slightly urbane, and much more flexible than people expect once you stop treating it as cold.
Woodwork first. Farrow & Ball All White (LRV 92) is the easy win: a clean, neutral white with only the faintest warmth, so it brightens the room without turning the blue-grey icy. The crisper and bluer your white, the harder and colder Long Acre will read — All White keeps it civilised.
Then decide whether you're warming it or deepening it. For warmth, Mylands Beehive Place No.140 (LRV 58.6) is a golden, honeyed yellow, and blue-grey with gold is one of the oldest tricks in the book — the yellow makes the blue look bluer and the whole room feel warmer. Use it in the hallway off the main room, on the inside of shelving, or in an adjoining space.
For depth, stay in the family: Paint & Paper Library Blue Blood (LRV 16.4) is a deep, inky navy with a cool green-grey undertone — a tonal anchor for joinery, a feature wall or a cabinet under Long Acre walls.
And if you want a proper accent, Dulux Fuchsia Falls 2 (LRV 29.8) is a bright, cool magenta-pink that sings against blue-grey — cushions, a front door, an inside-of-a-cupboard moment.
Materials: ebonised oak or slate grounds it; polished nickel keeps the cool register honest, while aged brass pushes the scheme warmer alongside Beehive Place. Both routes work — just commit to one.
Practical tip: paint two coats on A3 boards of Long Acre and your white, tape them together, and check them morning and evening — and under your actual bulbs, because blue-greys shift more than most under warm artificial light.