Episode #3.7 - S3-E7
DI Humphrey Goodman: Right, I'll keep watch.
Sergeant Fidel Best: You sure?
DI Humphrey Goodman: As Detective Inspector, I have a duty of care...Nothing to do with the fact that I won't be able to sleep a wink, with a killer upstairs. (00:35:40)
Episode #3.7 - S3-E7
Emily Benoit: Revenge doesn't pay the bills. (00:35:05)
Answer: Most likely they had only tropical exotic drinks, he wanted an old fashioned English beer.