BBC News By Greig Watson image copyrightAndrew Phillips image captionThe Broadmarsh has lain derelict for months and will take a year to demolish completely Have shopping centres had their day? With retail habits changing and the designs of the 1960s thoroughly dated, some centres are struggling to survive - but Nottingham has been offered a radical time-travelling solution to its own urban problem. "Always unwelcoming, now it's apocalyptic". It's not a tagline any city would want, but architect Peter Rogan's description neatly sums up the half-demolished hulk of Nottingham's Broadmarsh Centre. The 1970s concrete and brick monolith has reached this sorry state by lurching from one failed renovation plan to another over the course of 20 years.