The Londown | 25 February | This week in Architecture

Barbican Centre heading for major renewal after Centre for Music scrapped, a row over ‘poor cores’ in Walthamstow, the Church of England promises ‘generous’ use of its land for new homes and Boris Johnson’s vision for a huge roundabout under the Isle of Man – Merlin Fulcher and special guest Lucy Watson round up this week’s top London architecture news.