At least when Michael Carrick and his Middlesbrough side return to Devon later this week they will carry ultimately happy memories from this visit. An 82nd-minute penalty by Emmanuel Latte Lath propelled Boro into the Carabao Cup quarter-finals and proved the difference against third-tier Exeter City after four fantastic goals, two by Exeter’s Ryan Trevitt, punctuated a thrilling tie. This was anything but a comfortable evening for Boro, however, their analysts, as well as the first-team coach, Grant Leadbitter, in conversation with Carrick’s staff on the touchline throughout, were stationed in the main stand surrounded by some of the 1,031 away fans who made this mammoth trip. As Middlesbrough’s players and staff filed off the team coach about an hour and 15 minutes before kick-off some of the more eager Exeter supporters that had congregated on the Big Bank terrace at one end of this ground were already making a racket. A thudding drum provided the soundtrack for Boro’s players as they headed for the away dressing room and the home support invariably turned up …