My Dad is five years from retirement. His pension trustees have written to him advising that he should move his pension pot from its current equity units to cash based units. He understands the logic behind this but is unsure of when exactly is the best time to do this. He does not want to spend the next five years watching unit prices to find out the exact best minute to sell his current units and buy units in the cash fund. Is there any general rule of thumb (other than sell high and buy low)?