The Dispatch | Expert | Scudo Hub

I have a Citroen Dispatch 2005 (55 plate)  van, the battery is discharging overnight.

I found if I remove a certain 10A fuse, which feeds the blower, speedo and fuel gauge the battery does not run flat overnight.
I have either to pull this fuse or disconnect tjhe battery overnight.
Has anyone else had this trouble?
Is there somewhere I can download a wiring diagram for this circuit?
Is my Dispatch 55 reg known as any other name...i e jumpy?

What is a Bad parasitic drain value?
I think  when I measured it ...it was about 12mA

Thanks !