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The first place to look for hairs on violets are the petioles (leaf stems) and leaf blades. Ignore the rest. The only species with these parts both hairy are V. odorata and V.hirta and V. rupestris. The latter is very rare and I'll ignore it for this purpose. The next character to look for is whether the plant has stolons (creeping runners) or not. Very easy to see. V.odorata is stoloniferous, V. hirta is not. Both have blunt sepals - and I have to say that the sepals in the photographs are very blunt! Easy to say, but I've seen a lot of violets and I appreciate that descriptions are not always clear.
V. odorata is not always scented, although it can be a good character when present. But is is often white, as is this specimen. It's also early. So I suggest V. odorata, but check for stolons before making afinal decision.
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Great. Thanks. Seems like a good little group for creation of an iSpot key. http://www.ispot.org.uk/keys
University of Edinburgh and Biodiversity Observatory (OU)
Lat/Lng: 52.016217, -0.706228
OS grid ref: SP888360