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Stonecrop in my experience, is usually a short /prostrate plant with with white/pink or yellow flowers,& small succulent leaves shaped like small sausages, also tends to produce mats; so good for these green rooves that are being developed to slow down the run-off from them.
Sedum acre and Sedum album and some other species match your description, but Sedum reflexum is decumbent, and Sedum spurium has flattened leaves. Stonecrop, as a vernacular name is applied to all of these, and also to Sedum spectabile (showy stonecrop) and even to some Crassula species.
Lat/Lng: 51.5, -0.1
OS grid ref: TQ3286