Does anyone know what plant this is please?

[Tywysogesgymraeg]

Can anyone help me identify this plant?

Possibly a yellow Paeonia Suffruiticosa

Could be a Welsh Poppy

Peony without a doubt. A flowering Peony tree. You are lucky. I've waited years for mine to flower. It's got loads of buds, but I don't know the colour as it's grown by itself.

Second peony!

Tree Peony, you lucky thing!
Envious moi......

Agree with peony

Think it's Paeonia delavayii lutea
(in older books it will be called P lutea ludlowii)

Not a poppy. It's a bush. And think it is the peony Astran's post.

Alas not mine. Was growing wild near my house.

Thank you everyone.

www.irgardencentre.com/product-p/paeonia-delavayi-var.-lutea.htm

Maybe?? Does self-seed

I think it does self seed as I have two. The first one I noticed about eight years ago it just appeared alongside a conifer. The leaves fall in the winter, it's about 90 cms high and flowering for the first time. About a month ago I noticed a second one in another part of the garden, it's very young and about 30 cms high.
I've seen them in garden centres with red and pink flowers costing around £30.