Ive read the manual and i think a 3yr old kid could have drawn a better picture, any ideas please?

I'm going to guess on this one - are we talking the trip computer

Do you mean the inertia type, "I'm upside down, turn that fuel off somebody and put that fag out for chrissake" fuel shut off switch?
That's usually behind a small panel near to your passenger's foot near the door pillar

This is a LH drive picture so think mirror image if you're in a RH drive car