Airlines operate SOPs. Flying schools need to operate SOPs and do in the form of a flying orders book - it may just need more info.
I think it would be asking too much to create the same standards across the whole of the UK flight training fraternity because you will always have nuances based on fleet makeup, local requirements and so on. The same cannot be said for a purely local SOP, even including collaboration between training organizatons who operate out of the same field.
It does need people to go through the syllabus with a critical eye and highlight areas where there is the potential for variance. Decide on the best one, document it. Document acceptable alternatives (if any) and conditions for their use.
When that is done, you have a standards document which is good until it needs to be revised. Instructors should know it. Students can have access to it and it becomes the songsheet off which everybodu sings
