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I've just taken charge of an old communal garden where the shrubs/bushes were regularly hacked back to 'retain their shape' by the contracted "gardeners" and no-one can remember ever seeing them flower before.
I'm still trying to identify most of them and so thanks for naming this one which actually led me here - https://www.ftd.com/blog/share/types-of-hydrangeas
and the answer to my post 4822.Climbing Hydrangea !
Bees are all over this ...