Thanks for everybody's feedback, some interesting points have been made.
scroggs: I will question my FTO about the use of non-standard speeds, I haven't until now due to the fact that I am complying with their SOPs.
I'm on an asymmetric learning curve! I went flying earlier today, and did an asymmetric circuit with no rudder trim, and some assymmetric circuits with rudder trim - the trim was removed on the completion of the base turn to final. Despite what I've said, I've personally found that the latter method is prefered to the former. I found that using rudder trim in the circuit made it much easier to maintain heading.
I should be taking my test in a few weeks.
POL