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Forget being named as prime minister of the United Kingdom, going to meet his "bro" in the White House for the very first time or one of his famous pointing-at-fish holidays to Cornwall.
Forget them, because:
One of my favourite moments of the past five years was at a brick factory in Accrington.
In an article for the Sunday Telegraph, the prime minister recounted the joy he felt as he pressed the "on" button last month to restart the factory's kilns after seven years lying dormant.
He said it proved to him that "bit by bit, brick by brick, we are building a Great Britain truly worthy of the name".
But not everyone is convinced...