This follows a dispute about how and when to give Scotland more powers.
Joshua will meet the families and survivors of a building collapse at his church in Lagos.
Henning was captured by IS while taking medical supplies to a hospital in northwest Syria.
The farmers are laying claim to 45 million US dollars’ worth of diamond revenue from Zimbabwe.
About 70,000 Syrian Kurds have fled into Turkey since Friday as Islamic State fighters close in.
The historic march is taking place ahead of a UN Summit on climate change on Tuesday.