Let me pick up where I left off in a previous column. On sabbatical in China, I was reeling from being pored over by parents at the Shanghai marriage market, and judged to be too old and overqualified. But if no vigilant parent would have me for their offspring, perhaps someone in my more permanent home of London would? So I began again. Although nine months away from British dating apps had not changed them, something in myself had changed. The algorithms may rely on Photoshop and well-meaning...