I am really quite cross about this.
You get the gist of the article without having to go through the paywall.
www.thetimes.co.uk/edition/scotland/citys-schools-highlight-a-world-of-difference-between-rich-and-poor-63m6hb677
Within half a mile (google maps says 0.2 of a mile, in fact) there are two more schools, and their results are significantly higher. Given Scottish admissions, the catchment areas will overlap (esp. with the Catholic school).
I think she is very wrong to go to the papers in this way.