Demands that cannot be met

Sir, - Professor John Curtice says that Nicola Sturgeon’s speech was designed to make Theresa May believe that if she didn’t get a good deal for Scotland, the SNP would call a referendum and win it.

I am sure Mrs May knows three things: nothing she can negotiate will satisfy the SNP because its demands are designed to be rejected; the SNP can’t hold a referendum until the Brexit deal is known; this is about keeping party harmony and not mentioning education, health care, the named person scheme or fracking. Allan Sutherland. 1 Willow Row, Stonehaven.