Confidence: It might be this.
Notes: To me this has a more upright habit than H. non-scripta but anthers still appear creamy yellow, petals rolled back somewhat, flowers still more or less tubular. Does not seem pale enough for H. hispanica, or dark enough for H. non-scripta. Petals have darker blue streaks and margins. Snapped in a hurry, no pic of leaves and forgot to smell it (sorry). Does not look like any of our other bluebells so, assuming it IS a bluebell then presumably hybrid.