Still, google satellite view shows that island as substantially undeveloped. You get a narrow view, living in a big city. Start to think the whole country looks like out your window.

Not just that, there are huge amounts of unreclaimed brownfield all around England, waiting to be put to good use. This country used to be the engine of the world, that took a lot of land that is now just rotting away.

And of course, one could also envision policies that actually create attraction centres alternative to London. But surely that's unreasonable to expect.

Everywhere has limited land. The question is how close are we to the limit? Given that the UK is, depending on how you count it, on the order of 10% urban, we could hide another city in it without noticing.