https://cdnph.upi.com/ph/st/th/2061784535940/2026/upi_com/5530015e5af7486e60bc292f396331bb/v1.5/Andy-Burnham-to-become-British-prime-minister.jpg" /> Britain was set to get its seventh prime minister in 10 years when the king invites Andy Burnham to form a new government, weeks after he became an MP.