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I suspect from the size of the flower which has more than 5 anthers, that this is G. molle. It can have pale, even white flowers. It would have long and short hairs on the stems where G. pusillum only has short hairs, but the photos are not sharp enough to see this.
Thanks. I'm sure you're right. I had terrible trouble with this plant as there was only one flower easily accessible and it was difficult to photograph successfully.
Lat/Lng: 53.620745, -2.33284
OS grid ref: SD780138