A day that began with Ineos Team UK having to modify their boat Britannia following a protest from rivals ended with Britain’s America’s Cup challengers on top once again. Sir Ben Ainslie’s team followed up their stunning start to the Prada Cup on Friday - when they won their opening two races just weeks after being hammered in a warm-up regatta - by winning their only race of the day against American Magic. What is more, they did so in the sort of light, shifty conditions in which they struggled so badly pre-Christmas. Both Ainslie and tactician Giles Scott cautioned afterwards not to read too much into this win, with the conditions on day two so puffy that American skipper Terry Hutchinson was moved to call the racing a “lottery” and Luna Rossa helmsman Franco Bruni admitted the race course had been a “minefield”. But nevertheless, it was hard to escape the impression that Britannia’s comeback is real and they can now be optimistic about challenging across the wind range. The day had actually begun with Ineos on the back foot, an overnight protest from rivals Luna Rossa regarding the outhaul on their mainsail taking some of the shine off their brilliant opening day.