Thanks you for your constructive comments and suggestions Alfred, Fabs, Axel.
Alfred, I haven't used flash previously, however, through your comment, I sat yesterday in very poor light and tried it out with half decent results. Now I will endeavour to use a flash more often, I can see a huge difference, thanks for pushing me in that direction.
Fabs, you are so right about a slight separation, I agree it would have been better. It was pointed out to me that this image shows how nature designs itself so well, with the flower stem perfectly placed for the head of the sunbird to gather and distribute the pollen to the next flower he feeds from, still would have liked that separation though :), hopefully next time.
Axel, I had set up in a sitting position which best suited the light direction and position of the flower against a clean uncluttered BG hoping a SB would also play ball and feed from the right direction, luck wasn't on my side, he didn't land looking towards me but away from me, moving the tripod wasn't an option this time I'm afraid. I will try this again from the same position and with flash and keep my fingers crossed.