thanks for the link Whaet.
The stab trim is clearly indicated there to use hydraulics and there is no mention that the autopilot control of the stabiliser trim doesn't use the hydraulics as well. Looking at the use of the PES (pitch enhancement system) in this system (fm the R hydraulic sys), it adds to my thinking that the electric and autopilot control of the stab trim is indeed electir/hydraulic and the stab trim levers are mechanical/hydraulic.
maybe????.
I seem to remember when I got this question when I attempted the exam back in Dec that I put that the AP control of the stab/trim was electric/hydraulic. My memory may be playing tricks here.
Thanks for the input thus far guys.
B.