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... but I would not care to guess which of the many cultivars it is.
It is, I have to say, a lovely one! Very nice clear white, often the so-called "white" cultivars are dingy and grubby-looking.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Thanks - such a gorgeous plant, but I was completely adrift on the name!
Lat/Lng: 51.633, -0.767
OS grid ref: SU854934