‘Does anyone seriously doubt that this amazing scheme is actually going to go ahead?’ boomed Boris Johnson last week. ‘No is the answer!’ He was waxing rhetorical about the redevelopment of Battersea Power Station, the fourth such scheme since the landmark hulk’s turbines were switched off in 1975. The Malaysian consortium behind this £8 million gamble are ignoring both the site’s troubled history and my own advice — which was to lose the shopping mall plans and start digging for minerals — by going for a full-blown residential-retail-office complex that’s a sure sign of economic optimism, underpinned by mayoral enthusiasm.

But...