weed id please

This does not look like Lesser Celandine and is definitely not creeping buttercup so I would say Mouse ear hawk weed.
It is a weed and wants taking out, it will spread but not as fast as creeping buttercup or celandine.
I watched celandine cover the floor of the local woods from a few plants near a beck to covering and smothering all the banks around in less than six years walking my dog.

Frank.

Thank you one to get rid of then 

Anyone else confirm the weed ?

Yes   definitely one of the many variants of Hawkweed.

Yes me too. Though going with the definition of a weed as a plant in the wrong place I suppose it depends where it's growing. One woman's weed is another woman's wildflower

quercus_rubur wrote (see)

... One man's weed is another man's wildflower

Absolutely, I grow both lesser celandines and hawkweeds (several species), and buttercups, in the wild area of my garden.