News that the U.S. dollar was again spiking against the British pound today, on news that Prime Minister Theresa May's draft Brexit deal was coming in for criticism and had prompted two cabinet ministers to quit, was seen as adding fresh complexity to the difficulties American expatriates looking to buy…

Boris Johnson, the New York-born former mayor of London who recently resigned as U.K. foreign secretary, is well known to Londoners for having unofficially lent his name to a bicycle-sharing scheme (“Boris bikes”) that was launched in 2010, and with which he, a keen cyclist himself, was associated.