He reminds me of Paul Martin, Canada's 21st Prime Minster. Brown and Martin lost the party leadership to a rival who became Prime Minster, while they became Finance Minster/Chancellor of the Exchequer, and continue to plot to become Prime Minster. They were/will win at the leadership convention that remember/will resemble a coronation more than anything else.
If Brown follows the Martin path, expect a Labour minority, followed a Tory minority.
If Brown follows the Martin path, expect a Labour minority, followed a Tory minority.