But she refused to say whether the SNP would hold an election on the “single issue” of independence, despite it being part of Sturgeon’s plan to deliver a Scottish state. Opposition parties said the post exposed the “ridiculousness” of Ms Sturgeon’s plan, revealed just last week, to try to claim the general election was actually a referendum on leaving the UK. Asked on Tuesday whether an early election would be held as a de facto referendum, Mr Blackford said: “If there is an election before that [the Supreme Court ruling] Of course we will think long and hard about how to fight this election. But it will be about Scotland’s right to have a referendum and be an independent country.” An SNP spokesman later said independence would be “front and centre” in any upcoming election campaign. However, he refused to say whether this would be the single-issue “de-facto referendum” campaign that Ms Sturgeon has called for.