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: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
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