Looking at the job adverts then you need to read them very carefully:
Chef Manager is paying way higher than usual as it is an offshore post where the individual will be living on a rig...
The HR Manager needs to have post-grad Masters level education - not your average scribbly...
The HR "Partner". In business a "partner" is someone who operates at Board level and would equate in our rank terms to roughly 1 or 2 star - not your average SNCO or JO...
The Supply Chain Manager pay is about right for this industry. As I said before, stackers do carry more responsibility than scribblies, but less than techies. You can bet that a techie working for the same company at the same managerial level is earning 10-20% more...
Just my two-penneth...
LJ