Craving substance

The issue is simple. If there is to be a referendum in the "second half of 2020" or "before the end of 2020" then there must be a process by which that can happen. This process cannot be secret. It cannot be known only to Nicola Sturgeon and a few trusted colleagues. Options are not unlimited. If Nicola Sturgeon can work out what this process is, so can Boris Johnson's advisers.