We've just found this fellow in our garden. He'd made a home in a tub full of mud, unused turf rolls and plants. Due to the bulbous abdomen we thought it could be a false widow but there doesn't appear to be any of the tell tale markings. He's currently living in a jam jar (with some air holes) but not sure what to do now...
Its a fairly new housing estate we live in and its located in Titchfield, Fareham (between Southampton & Portsmouth) in Hampshire.
This appears to be a female Steatoda grossa AKA the cupboard spider & indeed, one of the false widow species.
They are reasonably common & can go unnoticed as they are quite shy, reclusive & not aggressive. Bites do occasionally occur, but are really very unlikely. Certainly remove any that may be found indoors (but don't expect those that have made homes outside to march inside over the winter, this is very unlikely), I'd be aware of their presence outdoors but accept that they are pretty much like any other spider (less dangerous than bees & wasps) & will avoid contact with humans if possible.