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... but it would have helped if some foliage was visible.
There is a Syrphus hoverfly on one. They don't look like Dandelion to me...more like Cat's-ear or one of the Hawkbits.
My Flickr photos...
Many thanks, Lavateraguy and Ian. Rough Hawkbit, perhaps?
... but rough hawkbit is relatively rare, and has prominently hairy stalks. It's not that. The small scals of the scapes, as cerigait now mentions points at Scorzoneroides or Hypochaeris, but to distinguish these you either need foliage or fruits, or to dissect the flowers.
Could I settle fot autumn hawkbit. (Looking up on the web, Scorzoneroides autumnalis and Leontodon autumn are used as alternatives.)
Lat/Lng: 51.4, -0.03
OS grid ref: TQ371686