Germany's World Cup stars are currently on parade through the capital Berlin after returning home with the Jules Rimet trophy.
Arsenal's Lukas Podolski is pictured with the trophy alongside Bastian Schweinsteiger on the bus.
Masses of fans have lined the streets to welcome the side - who beat France, Brazil and Argentina on their way to victory.
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The PM will sound out the possibility of new free trade agreements with Gulf states for once the UK has left the EU.
In the unexpected announcement on Monday, Mr Key said it was the "right time" to leave politics.
As the Government's Brexit appeal comes to the Supreme Court, here's a look at what you need to know.