I seem to have a few of what I think are False Widdows in and around my garden shed in Nottingham. I think we are a little further north than other sightings so I thought I would as for your confirmation.
This is a Zygiella species, most likely Z. x-notata. Harmless and very common indeed around (& sometimes in) houses, sheds, cars. They are also known as missing sector orb weavers, a look at their web will explain why.