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Could it be the albino form of Red Campion or the hybrid Pink Campion (Silene × hampeana)?
I agree with Peachysteve.
Thanks to you both. I wasn't even aware that there was such a thing as a hybrid form of the pink campion or indeed an albino form of the red c. I was unsure about my id as the sepals are so red, so I'm grateful for your clarification.
Lat/Lng: 57.66285, -3.61458
OS grid ref: NJ037648