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have checked the eol for nobils and their pictures show spiders with a lot more red/brown than this one, the marking on the back is so very distinctive too It is certainly one of the false widows but which one?
You're right not be convinced - only a small minority of spdiers can be ID'd from photos. But I think nobilis is much the most likely. The extent of the pale patch on the back varies but this has one of a similar shape/size -
Lat/Lng: 50.5, -3.5
OS grid ref: SX9472