I,m not sure Homebird there are so many daisy like flowers but argyranthemum comes to mind.

Looking at the leaves I think it may be one of the Leucanthemums, also known as the 'Shasta Daisy'

there are so many 'themums' that I get totally confused!

Look at the leaves Pam they are quite different.

The trouble is my leaves look similar, but from a market stall and proably wrongly labelled.......
Still its a lovely bright yellow for these grey days.....

I think its a Leucanthemum too - there are several new cultivars with yellow flowers - Banana Cream, Broadway Lights.

I too think it's a leucanthemum

I thought Lecanthemum 'broadway lights'. either way they are good plants.

If the leaves are serrated then it is a Leucanthemum.

Leucanthemum was my first guess too.