Sunny Sunday of Sun Orchids

On Sunday the Illawarra Branch of ANOS came for a tour of the highlights of the Southern Highlands. The weather was perfect for orchid hunting. Hot, and sunny, and a bit humid. The Sun Orchids were out in force.

Of course, the schedule is not accidental, for the ANOS people from the Illawarra know this area very well, and have collectively been visiting here for some 30 years, so they know when is a good time. But this year, the weather really Gods smiled on them. So did the Orchids.

I have no idea which type of Sun Orchid this plant might be.
The perianth segments (petals and sepals) were strongly reflexed back.
The column is pale blue at the base, dark purplish-blue at the top,
with a white section at the front, where they are normally yellow.

Here is a small image (only 400 pixels high)
showing the column details.
The little fluffy bits in the front are called "column arms".
Different species of Sun Orchids have
different arrangements of column arms
as well as variations in the lobes at the top of the column.

This is my next "puzzle".
There is no plant that I can see in David Jones's excellent book
which I can match with this flower.

The flower was a light powdery blue colour, with just a hint of mauve wash.
The flowers are lightly veined.
The column arms are very fine, and are slightly upcurved.
There are no other branches or structures on the column arms
apart from the fine fibrous brushes.

The column hood appears nearly black,
but on close examination it is a dark reddish-brown.
There is no sign of any yellow - which is normal on the front edge.

Here it is in close-up.
Not a hint of yellow to be seen.
Very odd.

I will publish more images over the next few days of different species of Thelymitra (Sun Orchids) which we saw.

Any advice on IDing these two plants would be gratefully received.