Bluebell identification

in Plants
Can you can you identify Spanish bluebells/English bluebells from the bulb? I have been given some bulbs and they are quite large, about 2cm across, and I thought English bluebells were quite small bulbs. I don’t want to plant them if the are Spanish variety.
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The trouble is , they hybridise very readily, so it's not just black and white, there are lots of shades of grey between them now.