It can be hard to tell sometimes. Tubular flowers on one side - non-scripta. Broad leaves, 3cm, hispanica. So maybe a hybrid. Any scent? Scented, non-scripta.
Thanks for trying @Obelixx & @steephill. The leaves are fairly large. I'll have a sniff tomorrow. Could it be a horticultural variety? I'm sure I never planted it so it must have come from a neighbour 's garden.
When I moved here about 35 years ago, there were a few patches of native bluebells in parts of the garden which hadn't been cultivated in a decade or more. Every year, they came up, looked wonderful and didn't noticeably spread. Then I bought a 'bulb collection' from one of the big names which contained Spanish bluebells. 30 years later, hybrids are in all of my borders and every time I plant or move something, the secondary task is to dig out the bluebells. I think there are still some unhybridized ones, but I no longer bother checking and just remove them whenever seen.
A trowel in the hand is worth a thousand lost under a bush.
Posts
https://www.plantlife.org.uk/uk/blog/whats-the-difference-between-spanish-bluebells-and-english-bluebells
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.