Chris
You will just have to trust the staff at ETPS to maintain professional standards. Knowing many of them personally I assure you that under the present arrangements they can and do fail students on the long graduate course from both home and overseas customers.
There is little doubt that the current arrangements of employing civilian ex service tutors at tps has strengthend the experience base of the tutorial staff compared to the old pure service system of posting in and out tutors every two or three years.
I don't think the standards of instruction have ever been higher myself.