Identifying a plant

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Here are some pics- the close-ups will be very poor quality as I had to zoom in to avoid slipping over on the decking!

Luckygirl they do usually have lots more open flowers surrounding the unopened buds as I say that’s not a good specimen

Ah no- the decking is very wet - I will take one later. It does look a bit like the mophead hydrangea, but it is flatter, and white.

I will sprint out in a mo and take a photo - in the rain!

As soon as you ladies suggested that I realised I have one, I ran down the garden and found just the one flower, bit of a poor specimen but I think you ladies could be right..

Great minds think alike (and fools seldom differ)

They sound a bit like lace cap Hydrangeas, but they are unlikely to be in flower yet.

X post!

Lacecap hydrangea?

They sound to me like lacecap hydrangeas.
pics and advice - www.gardeningknowhow.com/ornamental/shrubs/hydrangea/lacecap-hydrangea-care.htm

Could you post a picture?