Key points are not available for this paper at this time.
Allyson L. Walsh, Stephen Harris, Factors Determining the Abundance of Vespertilionid Bats in Britain: Geographical, Land Class and Local Habitat Relationships, Journal of Applied Ecology, Vol. 33, No. 3 (Jun., 1996), pp. 519-529
Walsh et al. (Sat,) studied this question.