Isee that Norris, along with Ken Livingstone (Labour), Simon Hughes (Lib Dem) and Darren Johnson (Green), will be appearing in an Architecture Foundation debate at the Queen Elizabeth Hall on Thursday 27 May (details 08703 800 400 or at www. rfh. org. uk). The AJ is the media partner for the event, which promises to be one of the biggest public debates on architecture since the foundation's London events seven years ago. Inevitably there will be much talk about the need for more housing. Astragal hopes someone will ask a simple question: will any of the candidates pledge to ban new development on flood areas prior to agreement on where the new flood defences will be located? This is an issue no-one wants to talk about. Of course, you could build on flood plains but you would need homes of a very different design. Who will enforce this?