If you want a Dulux match for Mylands Beauvais No.195, go for Dulux English Mist 4. It lands at ΔE 2.1 from the original, which is well inside the "very close" bracket — anything under 2.5 is hard to tell apart once it's on the wall, and you'd struggle to call it under normal lighting. Its LRV is 56.6, so it sits comfortably in that soft, light-but-not-stark range that makes Beauvais such an easy-going colour.
The next best is Dulux Valley Rock at ΔE 2.3, LRV 54. Also a genuinely close match — a hair deeper and a touch more grounded. If you're painting a north-facing room where the light pulls colours cooler and flatter, Valley Rock holds up nicely. For a brighter, south-facing space, English Mist 4 keeps things gentle without going washy.
Now, the honest bit: matching Mylands to Dulux gets you the *colour*, but not the *finish*. Mylands is a high-pigment, deep-bodied paint and its matt emulsions have a particular soft, chalky depth that Dulux's standard ranges won't quite replicate. If it's the look you love rather than just the hue, that's worth weighing up. For a closer feel at the trade end, Dulux Heritage is a step up in body and depth over standard Diamond Matt.
A few practical pointers, mate. Always sample before you commit — a ΔE figure is measured under controlled lab conditions, and your room's light, your existing trim and the surrounding colours will shift how it reads. Paint two coats on a bit of lining paper, move it around the room, and check it morning and evening. And don't judge a sample patch dried on bare plaster — the suction skews the colour. Sorted properly, English Mist 4 will give you Beauvais on a Dulux budget without anyone being the wiser.