On the Wednesday in early July when Rishi Sunak announced a temporary increase from £125,000 to £500,000 in the stamp duty threshold for house purchases, a record 8.5 million people visited the Rightmove property website and I’m pretty sure I was one of them. I continued visiting it weekly: it became a lockdown obsession, alongside French television thrillers, until last month I finally spotted a London flat I wanted to buy.