Britain expressed “concern” today after Kim Jong Un brutally executed his uncle. The North Korean leader accused his 67-year-old mentor of planning a military coup. In a 2,700-word statement the Pyongyang regime called Jang Song Thaek a “traitor to the nation for all ages”, “worse than a dog” and “despicable human scum”. A Foreign Office spokesman said: “We are concerned at reports of the execution of Jang Song-Thaek and oppose the use of the death penalty in any and all cases worldwide. We are monitoring the situation in North Korea closely in consultation with allies.