A rising star in Britain’s Labour Party, described by some as the “British Barack Obama,” Chuka Umunna urged the United Kingdom to more aggressively forge ties with West Africa's fast-growing economies. During a trade mission to West Africa last week that included a stop in his father’s home country Nigeria, Umunna, a member of the British Parliament, dismissed the comparison to the United States president. … Umunna, 34, grew up in Streatham and worked as a lawyer before being elected to parliament in 2010. The son of an Irish mother and Nigerian father, he said he made seven or eight...