could they be very young Hydrangea macrophylla such as 'Yofloma' (Yofloma Mophead Hydrangea) ?

Or Agastache 'Golden Jubilee'?

Thankyou both it does look like Agastache Golden Jubilee.

Great to know what it is - very pretty flowers.

I only know because I have some on the go myself to replace ones that didn't survive the wet winter last year ;-)

Thankyou I shall get a name tag done for them.