Where is my water pressure switch?

brainbug007

Hi,

 

We have just bought our first van, a Swift Fairway 460, a Broad Lane dealer special based on a Charisma. (2 berth, 2006).

 

Our water pump wont switch off and we've been told to look for a white water pressure switch.  We can't find it, does anyone know where it might be?

 

Thanks x