I did my RT training with Malcolm Dobson fairly recently, you will not meet a nicer more helpful chap. However the RT practical is not a formality and Malcolm treats it with the reverence it deserves.
My advice would be to give him a call before you think about taking a test.
Malcolm will tell you all you need to know and probably insist on giving you some training. I cannot stress enough this training will be worth its weight in gold.
Malcolms' number is on the Multiflight website