Sounds ok JP, I would just add the figure of eight test on the ring, that will pick-up a "ring whithin a ring" and also give the r1+r2 figure, also a Ze test should be done of course.
Right Sen and thanks. All points noted. Annoyed with myself for forgetting to list the Ze at origin - however the figure of eight test I must admit I didn't even think of (and wouldn't have carried that out), so that would go on the list as well as the Ze. Thanks very much for that Sen.
The figure 8 is the only way of getting an r1+r2 on a ring, much easier on radials of course, just link E and L at one end and measure at the other!