Naturalised daffodil for ID

[davidbr]

I know there's a whole plethora of Narcissus cultivars out there so some might prove impossible to identify, but this one had clearly survived for many, many years and looked to be spreading by seed, so I'm assuming it's a proper species or at least fertile hybrid.

I was thinking of Lesser Daffodil, N. minor, but the leaves seem too large - any other ideas?

[KeenTeen17]

It looks like N. minor to me. At first I thought primrose peerless but the flower is too yellow.

[Tiggrx]

Doesn't look quite right for N. minor to me.

Probably one of the plethora of unnameables