Whoever replaces Wigston as CAS will have an interesting challenge ahead, and it will be interesting to see whether someone similar or someone with different views on these matters is appointed.
With respect to the language issues, I also heard the stories when I went to Valley in 1978 but never personally experienced anything negative with respect to Welsh being spoken when I was around. I once spent a couple of weeks working with a French military unit in France where, obviously, French was the first language but they could all speak good English also and did so in any conversations that involved us. One day at the start of the second week our host started a conversation with me in French, not consciously because he was trying to prove a point but unconsciously because we were, effectively, part of the unit. I considered this to be quite a complement!