Glossy arrow like leaves growing in a clump
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Agreed, this is Arum maculatum. It is also commonly known as Lords and Ladies and occsaionally Cows and Bulls other less printable names.
Common names are memorable, wonderful but often regional.
There is also a garden escapee, Arum italicum with less pointed leaves and yellowish spathe lacking in purple tints, and a yellow spadix.
Lat/Lng: 51.558825523928, -1.8342601507902
OS grid ref: SU115844