Episode #1.7 - S1-E7
DI Richard Poole: Everyone had a motive.
Neville : Ahem, you missed someone.
DI Richard Poole: No.
Neville: Me!
DI Richard Poole: Well, you didn't do it...
Neville: Could have!
DI Richard Poole: Really? What was your motive?
Neville: He owed me money?
DI Richard Poole: Did he?
Neville: No.
[DI Richard Poole sighs, shakes his head and moves on]. (00:46:05)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.