Marbled Whites in South Wales

[Glostopcat]

Afternoon all, I have had an enquiry from a friend who lives near Merthyr Tydfil about sites where the marbled white can be seen in the area. Ideally he wants to find somewhere within an hour and a half radius. Does anyone on here know of anywhere suitable where he might be able to see them within the next couple of weeks, many thanks Ed aka "Glostopcat"