Locally recorded bluebells (according to ALA) are W.gracilis, W.cercea, W.capillaris & W.stricta. It could be a couple of those given a single image, but none are usually nodding or locally endemic.... W.rupicola and W.telfordii are restricted to small populations around Barrington/Ebor and the latter exclusively Ebor in NENP. Could be that I suppose? But I'm thinking genus as we don't have much to go off