British Prime Minister Boris Johnson and his partner Carrie Symonds have announced that they are expecting a baby in the early summer and that they have got engaged.

A spokesperson for the couple said: "The Prime Minister and Miss Symonds are very pleased to announce their engagement and that they are expecting a baby in the early summer."

Mr Johnson, 55,  and Miss Symonds, 31, made history as the first unmarried couple to officially live together in Downing Street when they moved in last year.

Ms Symonds, a conservationist and former Conservative Party communications chief, first found herself making headlines when she was romantically linked to Mr Johnson earlier in 2019.

But her association with Mr Johnson dates back to when she worked on his successful re-election bid at City Hall in 2012.

The announcement means Mr Johnson will become the first British prime minister to marry in office for 250 years, according to the Daily Telegraph newspaper.