For much of the 19th century the existence of a prime minister was denied on constitutional grounds.

Disraeli was the first to use the title officially when he signed the Treaty of Berlin as First Lord of the Treasury and Prime Minister in 1878.
In 1905, the Prime Minister was given precedence by Royal Warrant behind the Lord Archbishop of Canterbury and the Lord Chancellor.

But it was not until 1917 that the position was first mentioned in statute, for the trivial purpose of giving him the use of a country house.
In 1937 the Prime Minister was given a salary qua Prime Minister; before that the he drew a ministerial salary usually through his position as First Lord of the Treasury.

Until today the PM is seldom mentioned in statute and his powers are mostly based on convention alone.
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