Blue Blood is a deep, inky thing, and the worst mistake you can make is fighting it with crisp white trim. It'll look stark and cheap. The whole point of a colour this rich is depth, and you get depth by leaning in, not breaking it up.
Drench it. Walls, woodwork and ceiling all in Blue Blood, switching the sheen — a matte emulsion on the walls and an eggshell on the skirting and architrave. Same colour, different light response, and the room reads layered rather than flat. This is the single best way to use it, mate.
If the trim genuinely has to differ, go for a deep warm putty rather than white. Mylands Cigar BH.20 (LRV 11.8) is a lovely tobacco-brown that grounds the blue without jumping out at you. Avoid the temptation of a bright skirting at all costs.
For accents and the bits you can't paint — upholstery, joinery, metalwork — bring warmth in through burgundy and tobacco tones, never gold or orange. A muted copper sits beautifully against this depth: Dulux Copper Glow (LRV 30.1) works as a feature or in soft furnishings. Tarnished brass, aged oak and antique leather are your friends here.
Where you need a genuine light note — a ceiling in a low-ceilinged room, or adjoining woodwork — pick a warm, soft off-white rather than a brilliant one. Paint & Paper Library Sand I (LRV 95.4) or Farrow & Ball All White (LRV 92) both carry enough warmth to relate to the blue instead of clashing with it. All White in particular has no harsh blue undertone, so it won't go cold next to all that depth.
Practical tip: Blue Blood drinks light, so it's a North-facing or evening-room colour. Don't fret about the room feeling dark — that's the effect you're after. Layer in warm lamplight (2700K bulbs, never cool white) and let the tarnished metals catch it. That's where this colour earns its keep.