Confidence: It's likely to be this, but I can't be certain.
Notes: The clear wings with chocolate strip along the leading edge of the wing place your cranefy in subgenus Tipula (of genus Tipula) and it is a female. There are only three species to consider. The female of T. paludosa has shorter wings and appears in the autumn. T. oleracea has long-winged females and is on the wing now. From the photo alone it would not be possible to eliminate the third species, T.(Tipula) subcunctans, since this would depend on examining the space between the eyes on the underside of the head (and even then quite difficult to assess without the other species for comparison). However, like T.(T.)paludosa, it flies in October-November, and therefore is a poor candidate for this one. So, on balance of probability, it is T.(T.)oleracea. The larvae are leatherjackets and can sometimes be a pest in turf.