Grows in tufts/clumps and in large numbers.
'Rubbery' texture to the leaves - waxy cuticle?
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Without details of size and where it is growing, all you can say is that it could be any one of very many bulbous or rhizomatous perennials.
Based purely on the balance of probability, it is likely to be a cultivated, garden plant of some kind and at this time of year, in clumps that dense, that means a species or variety of bulb, possibly a species/variety of galanthus (snowdrop).
Looks like it could be a clump of the increasing Hybrid Bluebells that are escaping from gardens everywhere (especially London). Often these are hybrids with Hyacinthoides non-scripta x Hyacinthoides hispanica or it could be Hyacinthoides hispanica (Spanish Bluebell) which is less frequent
Agree with Genghis Attenborough. 99% sure it's a garden bluebell. Most likely the Spanish bluebell Hyacinthoides hispanica
Lat/Lng: 52.925663584372, -1.5039977431297
OS grid ref: SK334365