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This is a Geranium of some kind.
I'm still not convinced about this one... musk mallow also has geranium shaped leaves and the colour and shape of flower closely resenmbles musk mallow ... I will go back to the spot and take another look and see if there are any other characteristics I can use to help with id.
Thanks for your comments and if there are any other reasons it isn't mallow then please let me know - I'm just a novice at this!!
Lat/Lng: 51.3061, -2.1977
OS grid ref: ST863563
Housing at entrance to lane but then farmland (arable and some cattle) - hedgerows at side of lane with wide grassy verges. Housing is gradually encroaching on the land and probably much of the plantlife will be lost in years to come