Sorry I have searched and havent found a definitive answer to my question so if you think its a mong question then I apologise and will go shoot myself! What is the timescale between TSC(A) and TSC(B) before you have to start all over again? Can you complete a refresher course? My problem is that I completed TSC(A) and TSC(Inf) and then had to transfer because of work. I am joining a unit which requires me to do TSC(B) but because of the lengthy transfer I am worried I will have to go back to the start. Thanks for the advice.