That house at half a million pounds is nothing - a tiny house in West London costs that any day. Just one of the JW 4 bed bethel dormitory detached houses in Mill Hill would fetch over a million.
North Wales is stunning and the views are spectacular; but it rains there like it does in Ireland. The weather can be pretty miserable and the wind and rain will lash around that house much of the time. Sure it will be nice in summer some days but it will be unusual to top 75F and often a wet 60/65F at best.
From a business point of view they've got a lot of property for their money and it sits right in centre of the most Welsh-speaking part of Wales. I guess the big wigs will holiday up there on the pretext it's a "speshul vizzit" - being 250 miles from the UK branch "ice-box" will be nice.
Supporting the Welsh language is a waste of UK resources and as mentioned above if I lived there and had kids I would rather my child learned a major language instead.