Have a look at Chrysanthemum maximum (Asteraceae),
Leucanthemum x superbum Becky Shasta Daisies. Ox eyed daisy known as the Dog Daisy and Marguerite.

See I told you I knew nothing....didn't even spell it right!!! I've checked them out and they are oxeye daisies. Are they very invasive. I have heucera, hostas and lilly of the valley in the borders and don't want them to be completely swamped.

Nicky, I have just dug mine out of my border after more than twenty years of growth and i had over a thousand flowers, although they looked fantastic I had to downsize them! I now have a small bunch of fifteen which are much easier to handle, you do need to watch them but not for a few years. I call them Marguerite as my lovely old Nan used to and they came from her garden.

They are invasive and spread by seed as well as falling into their neighbours' space. Also be aware that they're not good as cut flowers as they don't smell nice. Guess where they get the common name "Dog Daisies" from?

Wonderful wildlife plants, though - used by many, many pollinating insects....there's some blurb about them in the article below:

https://www.ecocharlie.co.uk/blog/2011/06/planting-for-wildlife-daisy-daisy/

They are out all over the road verges around here, and very lovely they are too - if you don't want them to seed around then just remember to snip off the old flower heads before the seed ripens.

Hi Nicky I have them but I cut them down the the ground the minuet the flowers start to look tatty. They dont sound right for your bed as they do just that swamp!