Not quite enough characters visible to be 100 % but looking at those massive palps my punt would be a mature male Steatoda bipunctata, the most common and widespread of our six UK Steatoda species. This species is also known as the Rabbit Hutch spider as there is usually at least one resident in all rabbit hutches. They are also very common on fence panels, sheds, garages and outside walls of homes. It is not a species implicated in bites.
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