Or sweet violet?
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Its going to be difficult to identify from this alone sorry. Most of the distinguishing features are observed side on. :)
Are the sepals pointed or blunt? Is the spur curved/blunt/notched, is it lighter or darker than the petals :) Is it scented?
Oh dear I need to be a bit more thorough. Can't really answer most of those.
Will try harder next time!
Lat/Lng: 52.2, -2.3
OS grid ref: SO8060