There have been riots and protests in Lomé, most recently in November 2014. You should avoid all demonstrations and large gatherings anywhere in the country as they could quickly become violent. See Political situation

There’s no formal British diplomatic representation in Togo. In case of an emergency you should contact the British High Commission in Accra, Ghana. There’s an Honorary Consul in Togo, who can offer limited help. 

There is a low threat from terrorism. See Terrorism

Take out comprehensive travel and medical insurance before you travel.