The parity principle requires assessment of similarities and dissimilarities in roles, objective seriousness, and subjective circumstances; a co-offender's breach of conditional liberty (ICO) at the time of offending is a legitimate distinguishing factor warranting a higher sentence.
The full text is available to signed-in members, including the 4 later cases that cite this judgment.
3 of the 4 citing cases carry a classified treatment. How each court treated it is available to signed-in members.