In past, have only seen this plant-type in gardens, but this specimen found alongside a sandy path not far from the banks of Kenfig Pool
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The usual spelling for the common Crocosmia is Montbretia; if you put that into Get Recommended you get Crocosmia x crocosmiflora.
IIRC, Crocosmia pottsii is Giant Montbretia, and would include the cultivar 'Lucifer'.
Thanks lavateraguy; careless of me to miss the "t" twice. John
... in its database.
Lat/Lng: 51.5163, -3.7376
OS grid ref: SS795811