One is a basement flat in north London, the other is among the most famous addresses in the country, its black door - and chief inhabitant - instantly recognisable to millions.

So it came as quite a surprise to technology consultant Sam Bass when his home was involved in a case of mistaken identity with that of the Prime Minister.

The 24-year-old was sifting through letters in the communal hallway of his flat at 10 Danbury Street in Islington when he found a letter marked for 10 Downing Street.

And while the postman responsible could be forgiven for confusing the scrawled Westminster address with the terraced townhouse in the north of the capital, the intended recipient "Ms Theresa May, PM" is distinctly legible.