Ye white flower were connected but not sure it the Epimedium White Hart as this seems to have only one flower above each leaf whereas this one had lots of white ones per stem more like a heuchera or tiarella.
So if you can track down whose it was, you can maybe get in touch and ask. I didn't go and haven't watched much of the TV coverage yet so I don't know which one that is.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Not an autumn flower though so I'm probably wrong😉