"The costly gridlock: how can we keep our cities moving?" (Could start by killing off Tavistock Communications and Hammerson's Brent Cross shopping centre plans, and starting again.)

"As the UK's population continues to grow, transport systems in our urban centres will increasingly feel the strain. So what can be done?"

Drive to The Guardian web site

"Cities around the world confront a huge and pressing problem: how do you accommodate growing numbers of people? It is forecast that by 2050, two-thirds of the world’s population will live in urban areas, and transport planners face the daunting task of making sure everyone can move around without too much of a struggle.

"The UK's population is expected to grow by almost 10 million over the next 25 years – London’s population could reach 9.8 million by 2025. Since many of our cities already suffer from overcrowding on trains, congestion on roads and worsening air pollution, there is an urgent need to find new ways to adapt to the demographic changes.

"How will our transport systems cope? How might we best utilise new technologies to make our journeys more productive and less polluting? The Guardian, supported by Heathrow, recently hosted a round-table discussion to address some of these issues."