Thanks for these tips! I have now found one general view showing the control runs through the fuselage but could use some detail views of the torque tubes and bevel boxes etc. As I only need the images to illustrate a short section of a lecture I was hoping to avoid getting hold of complete manuals. The Britannia is a bit of an odd one out with regard to flight control connections which is why I'd like to spend a few minutes talking about it. I'll go and chase up these leads now!