[1] Univ Durham, Dept Geog, Durham DH1 3LE, England
[2] Univ Manchester, Sch Environm Educ & Dev, Manchester M13 9PL, Lancs, England
[3] KTH Royal Inst Technol, Dept Urban Planning & Environm, Div Urban & Reg Studies, Kungl Tekn Hogskolan, SE-10044 Stockholm, Sweden