OT, but what variety of citrus is it? It looks a little out of the ordinary. Judging by the pinkish flower buds my guess would be some sort of lemon or member of Papeda subgenus.
Thanks to all who responded ! I looked up on Australian paper wasp & found enough information. I got rid of it (egg in each cell) as it was in much used garden path. Pity, as it is beautiful! The plant is Australian finger lime (citrus caviar).
What a shame. @Megami posted photos on flickr a few years ago of some that she found at a market near Vancouver, but I wasn't able to find them at my local branch of that market. She said they were "$150 per kg!!!! 4 limes was going to cost $14". She seemed to have another source of them. Here is Meighan's photo of the fruit: Finger Limes
I only got rid of the wasp nest. The finger lime plant is in flower with lots of little finger limes appearing.
