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ID looks correct, but where did you see this? Could it be native - it looks rather too vigorous for this
It has grown in this area for a few years but nearby is/was a cottage the gardens are all over grown and this is probably what was the compost heap as it is outside on the edge of the area. I agree it is an escapee/throw out, I have recorded them for 20+.
Lat/Lng: 53.625122070312, -2.6431019306183
OS grid ref: SD575144