Whose official residence is 10 Downing Street?

Trick question, because most people know it as the residence of the Prime Minister and few people would know that he also holds that title. Boo.

Reggie the Rotter, The Prime Minister is The First Lord of the Treasury

Reggie the Rotter, According to Google, Both First Lord of the Treasury and PM whose official residence are in 10 Downing Street

Reggie the Rotter, so I googled it as I believed the same. Turns out the PM holds the office of treasury (wears both hats). So there you go - learn something new every day.

wrong answer. it is the prime minister's house