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A year ago I got relocated to the UK from the Netherlands and continued in the same company(in one of the big 4). As I was happy to have a job in my host country I accepted the salary of 38.500. Which was below the range for my grade. I know since a couple of months now that I am being underpaid.
Since then, I have talked to HR and talked to people in the firm and the only thing they did is putting me back on the grade and increased my salary to 40.000. Since then I have been talking to colleagues and they have said they were on 55.000/60.000. Some of these people even have less experience than I.
Now, I am currently on maternity leave and once I get back I would like to have fair pay as compared to my colleagues, but I do not know how to approach it. Any ideas?