Five years ago, in the depths of the Covid pandemic, a frenzied “race for space” propelled London’s residential property market. City dwellers were falling over themselves to swap one beds in town for detached houses in the ‘burbs with gardens, home studies — and room to breathe. Now London is facing a new property stampede. But this time, remarkably, and against virtually all expert predictions during those work-from-home years of 2020 and 2021, it is office space that is in hottest demand — and worryingly short supply.