Archbishop Vincent Nichols will be made a Cardinal by Pope Francis on today.
The leader of the Roman Catholic Church in England and Wales will join 18 others being elevated to the rank of cardinal in a consistory ceremony at the Vatican.
Sixteen of them are under 80 - meaning they will have the right to vote for the pope's eventual successor.
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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.