Concept:The question tests the features that are not associated with the 1954 Lyttleton Constitution.
Explanation:The Lyttleton Constitution introduced a true federal structure for Nigeria.
It also granted real legislative powers to the regional legislatures.
Furthermore, it recognised the need to appoint Premiers in the regions.
These features make options A, B and C genuine achievements of the Lyttleton Constitution.
However, the establishment of a public service commission was a notable achievement of the earlier 1951 Macpherson Constitution, not the Lyttleton Constitution.
Therefore, the public service commission is the exception among the listed features.
Answer:D. the establishment of a public service commission