Currency mix is interesting as is so many large English groats, not pennies, alongside gold. Seems to me a savings hoard where you put aside the best coin. Cappercleuch is halfway between Edinburgh and border but not so close as to expect English coin to circulate

https://www.scotsman.com/news/environment/stash-of-15th-century-coins-discovered-by-metal-detectorists-in-borders-4998502