This article lists which other significant offices have been held by the prime ministers before and after they have come to power as Prime Minister of the United Kingdom.
[1] The positions and amount of experience a prime minister has acquired has changed over the years, with modern prime ministers having gained experience through leading the opposition, while earlier prime ministers would be more likely to have held roles within the government.
Usually a prime minister does not hold high office again after leaving the role.
However, there are some cases where individuals have gone on to hold senior roles in future administrations.
[2]