Stephen - there are 300,000 existing planning permissions. That's enough for just over a year's supply if we were to meet Kate Barker's target for new homes. The brownfield first policy caused a disastrous increase of densities in some areas, including garden grabbing. Other uses should be considered for brownfield land including open space. Islington, for example, has virtually no open space and it is simply wrong to cram yet more building on every scrap of brownfield land that becomes available.