Nicola Sturgeon’s famous – critics might say notorious – 2015 statement on her ambition to eliminate the attainment gap has attained almost mythic status.

Even casual observers of Scottish education are aware of it, and it now fuels almost every political debate about education. Yet this landmark statement is hard to find, and any reference to it tends to rely on paraphrasing from memory rather than citing the exact words that the first minister used at the time.

Partly that’s because, in retrospect, it looks like a promise that was made one time only: ever since, government ministers have frequently made references to their determination to close what they call the “poverty-related attainment gap”, without going as far as to say they will eliminate it entirely, as Sturgeon did in August 2015.

Want to see more SNP fails? – Health Matters

Sign up to receive our weekly newsletter and join the fightback against Scottish Nationalism.