North Korean leader Kim Jong-un. Picture: KRT via Reuters TV

London - North Korea has written an official letter of complaint to Britain over a London hair salon's advert implying that Kim Jong-un has a bad hairstyle, the Foreign Office confirmed on Thursday.

The Stalinist state has failed to see the funny side of a discount haircuts advert featuring Kim at the M&M Hair Academy in Ealing, west London.

The poster featured a large picture of Kim with his distinctive short-back-and-sides hairdo and the slogan: “Bad hair day? 15 percent off all gent cuts through the month of April.”

British police intervened after North Korean embassy officials paid a visit to the salon and told hairdresser Mo Nabbach to take down the “disrespectful” poster from the window.

Besides turning up in person, the North Korean embassy in London has also written to the Foreign Office demanding action.

The embassy is a suburban detached house in Ealing, a kilometre away from the salon.

London is considering its formal response.

A Foreign Office spokesman told AFP: “We have received a letter from the Democratic People's Republic of Korea embassy and will respond in due course.”

The poster had been taken down by Wednesday. - AFP