Interesting @Silver surfer , how common names of plants vary so much.
I've always known the one in your pictures, with the white daisy flowers, as feverfew (Tanacetum parthenium) and what I call Tansy (Tanacetum vulgare) has clusters of all-yellow button-like flowers.
Apologies..you are completely correct..my error. I selected wrong pics. Ooops! Sorry.
That's the one! Saw some at Ripley Castle yesterday and had a complete mental block and couldn't remember what it was until I looked at this thread earlier
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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I selected wrong pics. Ooops! Sorry.
Tanacetum parthenium..common name feverfew.
https://www.rhs.org.uk/plants/17986/tanacetum-parthenium/details
Tanacetum vulgare...common name tansy...see below
https://www.rhs.org.uk/plants/17990/tanacetum-vulgare/details