These may well be some sort of bluebell, but until they actually flower, there is no way of distinguishing between native and Spanish ones. Native blubells are always blue, never pink and the flowers are only on one side of the stem, Spanish ones have flowers all round the stem and may be any colour from pure blue to washed out pink. Hybrids may have a combination of these signs. There are other signs too, but these are the important ones.
Bluebells (Latin names have changed rather too often to keep up with) have 'naked' bulbs. (Tulips and Narcissus have tunics) This is why they do not store that well dry. Also the depth of the bulb below ground can be staggering. We have gone down over 12 inches to try to eradicate some Spanish ones, so be warned.