A Brilliant Blue Butterfly flew by the Buddleja

No photos, unfortunately, but my brother and I were outside looking around a the swirling cloud of Butterflies around the Buddleja bushes, when I spotted a blue flash - an almost iridescent blue colour.
At first I dismissed it as an optical illusion, but then we both saw something.

It warranted investigation.

After a few minutes we saw another.

The Macleay's Swallowtails and the other Butterflies immediately gave chase, and shooed it away. But not before I could ascertain that it was indeed a visiting Blue Triangle Butterfly.

It is going to be really hot tomorrow - perfect weather for Butterflies, so I hope to get a photo or two.