Thanks everyone on what is probably my most successful thread to date! They were very entertaining to watch. I found that some were very friendly and I could literally walk up to them, crouch down beside them on a rock and snap away. Others were more weary but there were over 100 to choose from.
The only down side is that they did smell a bit fishy! Planning to return to the lovely Cape Point in the future. Wait til you see some of my shark photos!