Finance and Accountancy Careers Content Blocks
Why don't you just ask him? A basic google search will tell you that salary on qualification is around 40/45K. So if he left of his own choice, I doubt he took a lower salary, unless it was a work /life balance choice. In choosing a bank as his employer i doubt he's working less hours, so you can assume he's earning more.
Edit: the 45k mentioned above is also London salary I believe
In certain other industries you could look at getting £60k for sure in the current market, there just might just be a less of them.