Gordon Brown's resignation speech to Labour

The speaker outlines future plans and emphasizes the strength of unity within the party. They express gratitude to Labour staff, volunteers, and supporters for their past and future contributions. Special thanks are given to Harriet Harman for her leadership and work on equality, as well as to Douglas Alexander and Peter Mandelson for their efforts in the election campaign.

What is the main message conveyed about teamwork in the speech?

What has Peter Mandelson contributed according to the speaker?