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Could you give an identification of scale - particularly the size of the flowers. The flowers are overexposed, which makes their colour less reliable (and digital camera colour rendition is bad in the pink/purple region to begin with), but my first thought would be G. pyrenaicum, rather than G. molle.
The flowers were about 0.75cm across. I have attached a further image which may give a better idea of the colour. On reflection I now tend towards your id with which I shall agree when you make it. Thanks.
Stace says that the petals of G. molle are 4-6mm (long) and those of G. pyrenaicum are 7-10mm. So by flower size it would appear that your original identification as G. molle was correct.
If you want to consider other traits, apart from Stace and Poland, Flora Iberica (www.floraiberica.es) has detailed descriptions of both species (http://www.floraiberica.es/PHP/cientificos_.php?gen=Geranium)
Lat/Lng: 52.160518, 0.773196
OS grid ref: TL897549