Theatre Royal PlymouthJesse Jones directs a superb production of Samuel Bailey's nuanced drama about a friendship between two young men which is put to the test Fletch and Liam have been best friends since they were six. But tomorrow, Liam is off to Oxford University. "I'm your mate," Fletch tells him. "That should mean something. That should mean you don't just leave." We are introduced to the 18-year-olds in a car …