LONDON—Scottish support for independence has fallen four percentage points, probably due to divisions among Scottish nationalists, but 47 percent of Scots still support breaking up the United Kingdom by going it alone, a poll indicated on Thursday. A Savanta ComRes poll for The Scotsman showed 47 percent would vote for independence and 42 percent would vote against, up 4 percentage points, with 10 percent still undecided. Scottish nationalists are pushing for an independence referendum to be held after this May’s Scottish parliament election, but British Prime Minister Boris Johnson has said such votes should happen only once in a generation. Alongside polling on independence support, the survey found that Scottish Conservatives had gained popularity while there was greater support for both Johnson and the British government. Scottish First Minister Nicola Sturgeon has been accused by her predecessor and mentor, Alex Salmond, of misleading parliament over the government’s unlawful investigation of sexual harassment …