Hello from South Lanarkshire
Your boggy bits would be perfect for a wide variety of willow, which help to suck up the wet, cut down the wind, provide you with logs and provide the bees with early nectar. If you think it's a good idea, I have all sorts of willows growing here, and you are welcome to as many cuttings as you want, free - you'd need to collect them though. There are short growing ones, big bushy ones, fast growing, round catkins, black catkins, tiny catkins, long leaves and short leaves, early nectar and later nectar.
Should you decide to keep a few rare breed sheep after all, for your table, then they love willow, especially in the winter when fresh grazing is in short supply.