Found wandering around the greenhouse. Hairy legs. Pretty markings on orange/red abdomen. Too colourful for Araneus diadermarus?
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Araneus diadematus do vary a lot in colouring and appearance, especially it seems with juveniles.
I suspect this is an adult female that has spun her egg case. That's why her abdomen looks somewhat deflated and the shoulder pads are so obvious. If so, her 'role' is over and I guess she'll soon die.
Lat/Lng: 52.1, -0.1
OS grid ref: TL3351