Spanish bluebells - Hyacinthoides hispanica. Our native bluebell is Hyacinthoides non-scripta. They are members of the asparagus family - Asparagaceae.
At a guess, I'd say Hyacinthus orientalis. When they're in the ground, they do tend to produce sparser flowerheads than when you buy them potted. It's a good sign that they're multiplying and flowering, as they are naturalising nicely there. I don't think they are Spanish bluebells--which I'm plagued by in my own garden--not least because of the dark stems. They could be something like 'Blue Jacket' which is often sold for naturalising in gardens.
A better guess than mine. I focused on the flowers being distributed round the stem unlike our native bluebells. Note to self - must check stem colour of my plants.
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