Thanks for all your replies, I have attached a close up view of the aerial roots, all are in lovely condition and growing in earnest! The media looks fine to me, I am careful with my watering so it hasn't rotted or become mouldy, actually there isn't a lot of media left further down the pot as there are more lovely roots there. If I were to repot I would leave the aerial roots out, the main thing that is making me keen to is simply that the plant is now so heavy and at such an angle soon it will hardly be in the pot at all!
RosieC you mentioned repotting when there is root growth, why is that? My instinct was to wait until it was sleepy and then do it but I'll be guided by your experience
