Thanks Roy.
I searched on google and the best I could find is: KT 3432 V. Fuchs Rood x Ascda. Krailerk White sold by Kultana. Fuchs Road is not registered in RHS.
But I also find the following hybrid from RHS database:
Ascd Kultana White Will: Ascd Krailerk White x Vanda Kultana Gold
Ascd Kultana White Wing: Ascd Krailerk White x Vanda Rasri Gold
Both registered in 2007 by Kultana.
Looking at Kultana Gold and Rasri Gold, it can be either of the two as the parent. Or I can contact Kultana directly for confirmation.