Edward Bulmer's Jonquil is a lovely soft, sunny near-neutral — but Edward Bulmer is a premium natural paint, and you're paying for the pigment quality and the eco credentials. If you just want the colour without the price tag, there are genuinely close matches out there.
The pick of the bunch is COAT::Factor Fifty. It lands at ΔE 0.8 from Jonquil, which is below the threshold the human eye can detect — to all practical purposes you're looking at the same colour on the wall. At LRV 57.3 it carries that same gentle, light-but-not-stark quality. COAT is a B-Corp brand with a solid, washable emulsion, so you're not sacrificing much on quality either.
If you'd rather a big trade brand, Dulux::Soft Almond 4 is the one. At ΔE 2 it's still very close — you'd struggle to spot the difference unless you held swatches side by side under harsh light. LRV 51.8, so a touch deeper and more grounded than Jonquil, which can actually be flattering in a north-facing room where you want a bit more warmth holding the colour.
Crown::Pale Rose Gold is the further outlier at ΔE 3.5 — close enough to read as the same family, but at LRV 60.5 it's noticeably lighter and leans a little pinker. I'd only go for it if you actively want a softer, airier version.
The one thing to watch: Edward Bulmer paints are natural and have a particular chalky depth that mass-market emulsions don't quite replicate, even at a perfect colour match. The hue will be bang on, but the *finish* character is part of what you pay for.
My advice — grab a COAT Factor Fifty sample pot, paint a decent A4 patch, and live with it across a day. At ΔE 0.8 I'd be amazed if you weren't sorted.