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Often known by its older name Pachyphragma macrophyllum.
Thanks for the identification. In fact, Stace 3 lists it as Pachyphragma
I had entered it as Pachyphragma but iSpot changed it, so assumed that it was the latest name. I didn't think to check Stace as I used to grow it in the garden.
Lat/Lng: 52.23741, 0.24034
OS grid ref: TL530622