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I seem to remember that it is about 20 species in the UK, but could be wrong!
My Flickr photos...
Itd be tricky telling them apart? I saw a large green lacewing this summer. Didnt get a pic though. Id say it was around 4cm long, head to end of wings. Maybe just under 4cm but it was way bigger than the usual ones I see.
At this time of year, and given the general appearance, I think this is most likely to be Chrysopa carnea (or at least from the Chrysopa carnea group, which has been split into several species). C. carnea is the only green lacewing that overwinters as an adult, and is the one commonly found hibernating in garden sheds etc.
However, to really confirm it you need to check the wing venation, see my post here:
Unfortunately in the photo above the critical part of the wing is obscured by the lighting reflection, so I can't confirm this one :-(
Entomologist and biological recorder
Lat/Lng: 55.024, -6.092
OS grid ref: NW385775