I took record shots of the upperside of both species, but at quite a distance. I'll post the uppersides later on to re-confirm both species. The Bassarona that I shot was obviously a different individual from Chng's. There were a few around, so it's quite possible that both species were found there too.
As for the Appias, there was a distinct black border on the upperside forewing that led me to conclude that it was the Saletaria. Shots to follow later tonight.