Help needed with pipe from Throttle Body/Idle Motor

Hi there,
Was hoping someone might be able to help. I have replaced all of the vacuum pipes on my Freelander 2001 2.5 but one pipe is missing from the set I was sent by Landrover - I have circled it in red in the photo. Can anyone tell me where this pipe goes and what the other end connects into please?
Appreciate the help
Steve

That pipe goes to the pressure regulator, although it's not actually a pressure regulator on the FL1. I've put a red dot where is connects.

Thanks for your help! Very much appreciated.