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...sorry to disappoint but I don't think so - it would have less pointed petals and they would have purplish veins, plus the flowers wouldn't be clustered. Though out of focus and I can't see the leaves, maybe White Stonecrop?
thanks to you all, I'll keep looking for the snowdon lily! Colin
Lat/Lng: 53.0, -4.1
OS grid ref: SH6156