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... 'Loveliness'/'Sussex Beauty' type, which are the ones that I've seen persisting as throwouts - they're reliably hardy rhizomatous perennials.
They are also sterile (even when grown together, and with other varieties, so I don't think the sterility can be put down to self-incompatibility), so I suspect that they are hybrids.
Lat/Lng: 51.0, -3.5
OS grid ref: SS9829