I am not a supporter of an extra runway at Heathrow Airport. I do think the surrounding airports for London can be developed including London Biggin Hill. Goods need moving from Heathrow. What is needed is flexibility and capacity shifts in public transport. I have been interested in this for years, and is why people are surprised at my knowledge of London locations. I've developed maps and routes to enhance the London Overground as an alternative flexible system around the London Underground, with its own distinct colour-marked routes rather than orange everywhere. There is a single line going through Poyle and Stanwell Moor. The latter is hundreds of yards from Heathrow Terminal 5 and could be connected by a travelator. Buses could link the terminals to Wraybury on the line coming south from Windsor.
The maps are in the Localities Area of the Pluralist Website. The updated webpage of routes and now achieved is at http://www.pluralist.co.uk/localities/clitlilovlun.html and links go to all maps from there. The maps are standard, then with Crossrail 2 in original and updated forms, one set more geographical and one more diagrammatic.