Edgecomb Gray is one of Benjamin Moore's most-loved warm greige — that lovely soft beige-grey that flatters most rooms. But BM isn't cheap to get hold of in the UK, so if you want the look for less, you've got proper options.
The standout is Dulux Antique Map (LRV 63). It lands at ΔE 1.4 from Edgecomb Gray — that's well inside the "very close" band and most people couldn't tell the two apart on a wall. Dulux is widely stocked, the trade emulsion is reliable, and you'll pay a fair bit less per tin. For a like-for-like swap, this is the one I'd reach for.
If you'd rather a slightly different formulation, Crown Recipe Book (LRV 65.7) comes in at ΔE 2 — a touch lighter and a hair off the original, but still a genuinely good match. Crown's mid-sheen and matt finishes are solid for living rooms and hallways.
COAT Duvet Day (LRV 70.6) is the lightest of the three at ΔE 1.9. Because it's a notch brighter, it'll read fresher in a north-facing room where Edgecomb Gray can go a little flat. COAT is a direct-to-you brand, low-VOC, and the matt has a nice chalky depth.
The "but what about" here: ΔE figures are measured on the paint film, not in your room. A greige like this shifts with light. In a south-facing space all three will warm up and feel almost identical; in cool north light, Duvet Day's extra LRV gives you breathing room while Antique Map stays closest to the BM character.
Do the obvious thing — order sample pots of Antique Map and Duvet Day, paint two coats on A3 lining paper, and move them round the room at different times of day before you commit. That ten quid of samples saves you repainting a whole wall.