QA culture: Externally commissioned work - check and fix. After #176

[irisoren-sg]

@rebecca-wodcke-gad Also, can you check the externally commissioned section after we merge #176. The sentence "The guidance mentioned above also applies to Arms Length Bodies. They may set out in a framework document how their Accounting Officer will demonstrate compliance with Annex 4.2 of Managing Public Money and the Analysis Function Standard", is not clear. What is "the guidance mentioned above"?

The section differs from main branch, and I am wondering if it got into a jumble with merge conflicts

[rebecca-wodcke-gad]

@irisoren-sg yes, I think there was a merge conflict issue here. Even after sorting, it was saying the same thing several times, so I've simplified.