I would imagine it would be best moved in late autumn, when all signs of life have left the plant and it is shutting down for the winter. If you are worried about losing it, could you postpone the move until next year, but meanwhile select a low-growing branch (or two), scrape away the bark on the side nearest the soil, then bury it, pinning it down with a tent peg or the like. You will probably find that next spring it will be showing signs of growing independently of the mother plant and you can either pot it on, or plant it in your chosen alternative spot. They do tend to grow massively and need a good, hard prune each year to keep them in check, but they flower for such a long time, and if it's very hot the flowers tend to revert to white, regaining the red when the weather becomes cooler again.
