English bluebells are an urban myth!!!!
Either that or a vast fraud. I have purchased Hyacinthoides non-scripta from 4 'reputable' dealers and at 3 different nurseries over the past 5 years. This spring I notice that I have added another group of H. hispanica to my garden as I have in the past. Not a single bulb of all these purchases have had "flowers appearing on one side of the stem and a nodding floral stem". None either have any notable fragrance. I'll try again this fall but i doubt I'll have better luck.