Jerry, Scilla verna is indeed a nice plant but the UK native form tends to be rather smaller flowered than the iberian populations, and as you state, tends to be slow to increase. Given the wide range of 'alternative Scillas' for spring bloom it is not one of 'top British bulbs', but is still worthy of consideration for the spring garden. The daffodil, Narcissus pseudonarcissus, is also a nice plant, best suited to naturalistic planting in a woodland or parkland setting. Whether it is a true native of the British Isles is a matter of some debate - it may have originated as an introduction in medieval times. Selected forms were grown in past times for the flower trade - my mothers garden contains rows planted in an old orchard which are known to have been present since at least 1935. These plants, the flowers of which resemble Narcissus pseudonarcissus but are much larger, remain free flowering and continue to flourish despite the formidable presence of several species of Narcissus flies (Merodon equestris and Eumerus spp.)! Interestingly there is no evidence of self seeding suggesting possible clonal origin, although they might also be of hybrid origin. Wild populations vary in seed production, some producing virtually none, again suggestive of clonal origin. Regarding bluebells, which over the years have been variously placed in Hyacynthoides, Scilla and Endymion amongst other genera, I have not seen the 'Ranmore' form that you mention. I assume this may originate from Ranmore Common in Surrey which has spectacular populations of the plant. I have however seen white forms in which the flowers retain some blue pigmentation in similar fashion to that which you describe in a population on the Isle of Wight. Interestingly the same population contains a few bracteate blue flowered plants! Occasionally one sees evidence of hybridisation with the Spanish Bluebell, H. hispanica, a common garden plant in the UK that frequently 'escapes' via dumping of garden refuse. Best wishes Robin Attrill