Over the years there have been many syllabi; Longmans; Pitmans; AOPA; Cessna etc but at the end of the day most FIs teach as they were taught on their FI Course, irrespective of what named syllabus a school might claim to use. I recall one large commercial school that up to a year before it closed down did not have a course syllabus, it just taught the exercises in CAP528 The Commercial Flight Instructor's Guide.
A change to the exams is most welcome and the chance of having relevant questions at last is long overdue sadly, the powers that be could not be convinced to simplify things by producing 2 or 3 composite papers.