Thanks for the comments (forgot to subscribe to the thread so I only saw them returning to the forum to kill some time soaking up the excellent pictures posted by the other contributers and trying to learn from the comments)...
As for the background, well I have sorted that issue by returning a day later to the same spot and searching the place high and low (more of the latter) hiking 13km (according to my GPS tracking device) in the process of locating another wasp spider which offered better photographic opportuinites. I'll post the results of that effort later (I am still not sure which of the pictures I took I should post)...