He said this in an interview with Politico. 

Dearlove noted that if a passerby in Britain were asked whether the country was currently at war, he would look at the questioner as if he were crazy. 

“But we are at war, we are fighting a gray war with Russia, and I am trying to remind people of this,” he emphasized.

Dearlove did not specify what he meant by this term.

Earlier, President of Belarus Alexander Lukashenko said that fears about the possibility of a third world war are not unfounded.