80 inches long, or around?
"You may take bags up to the dimensions 190cm x 75cm x 65cm (75in x 29.5in x 25.5in), including the handle, pockets and wheels." So BA won't let you take something 80 inches long; you'd need to send it as cargo, as it won't fit into the luggage containers that are used to load luggage on to the aircraft.