First up, why aren't we making better use of our roof spaces? There's obviously Kensington Roof Gardens, but that's about novelty rather than industry. Imagine if London was home to a network of roof gardeners who grew produce for their building. Roof allotments would have waiting lists of well-heeled urban farmers and London would have more produce. The guy at Konstam would be spoiled for choice. I say, let's reclaim the roofs.