I asked them. This was their response:
"... I will make references to the pictures on: butterflycircle.blogspot.com/2017/12/butterfly-photography-at-our-local.html
At SNP, there is this viewing platform (Pic 9) whereby you can see an open area with a concrete area and many nectaring plants grown. (Left area in Pic 10).
Walk down to the back of this area (Pic 11) and you will see a row of Leea rubra (Pic 12). Note that this row of Leea rubra is not next/near to the canal but rather, next to the big grassy area where Grey Pansies, Common Sailors and Bushbrowns can be found.
The shot was taken on 31 Dec 2018, around 9am. There was only 1 individual spotted that day..."
Definitely checking it out when i return