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Why rash? Are you thinking it might be italicum?
I know it's unlikely, but I wasn't sure how (apart from the location) to discount it being italicum or maculatum x italicum. I'm guessing italicum fruits wouldn't have started to mature as early as July, though?
I guess you are right to be cautious. british-wild-flowers.co.uk shows red fruits on italicum by mid-August.
Lat/Lng: 51.6957, -1.7473
OS grid ref: SU175996