That's a very nice flower, unfortunately it is not P. charlesworthii but a hybrid. The species carries inflexed petals, not reflexed. The base of the dorsal sepal is much too wide, as is the ventral, and I've not seen such webbing on any P. charlesworthii. A slight possibility does exist that this could be bred from highly selected clones, but I seriously doubt it. I'd check with your source to see what you can learn.