McLaren will have a raft of upgrades big enough to be described as a B-spec car mid-season that should be influenced by its new technical model, says team principal Andrea Stella. James Key has left as technical director with McLaren last week announcing a new structure that includes three specific leaders within its technical team. Although David Sanchez can’t join from Ferrari until 2024, Stella says there are three clear updates planned with the second being a major car revision that the new technical heads will have impacted on. “So the improvement of car performance should start in Baku,” Stella…