This is still an incorrect approach looking at incorrect metrics. According to the government document:

>The gender pay gap is the difference between the average earnings of men and women, expressed relative to men’s earnings. For example, ‘women earn 15% less than men per hour’.

But this is not what should be measured. If there's a mining company that employs 90% men working down in the mine and 10% women doing accountancy, then of course the average wages of men are going to be different than those of women, but that tells us nothing about equal and fair treatment of men and women at this company.