I tend to agree with Sergio for Theridiidae. Although from the other side of the pond, nowadays one is not always sure what has been unwittingly introduced.
http://www.projectnoah.org/spottings/11340005
Nice, great to see all the spiderlings! In North America the only spider that makes an egg sac like that is Parasteatoda tepidariorum. It's a cosmopolitan species, so it's probably in your area too. There may be other possibilities though.
http://bugguide.net/node/view/6919
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