Alice Mah will be discussing her comparitive study into urban dereliction in three contrasting contexts - Newcastle in the UK; Niagara Falls in Canada and Ivanova in Russia.

Also, the geographer Kendra Strauss talks about her research into the origins and rise of gang labour in the UK. 

Thinking Allowed is on BBC Radio 4 on Wednesdays at 4.00pm and repeated on Monday mornings at 12.15am. Full transmission details, and listen again links, can be found on bbc.co.uk