Thanks Alan, its not a specific requirement out here but its not beyond my thoughts though, will need to justify it.
Your resto's will have all the lines flushed I assume as you will have them all off the cars, im not pulling them off the car so getting the old fluid out seems like all I can do is just flush it via topping up the master cyl and pumping it though, how will effect going to the new regarding contamination etc, if any