I understand all
Wood Pellet are currently imported from Northern Ireland Germany or Austria and will be so for some years to come. Not very green...
Rats: they can eat concrete too, I can tell you from personal experience. However it takes them longer which is one reason why I would never buy or build a timber frame house in Ireland.
They like any warm chewable habitat where there is also food nearby (your garden compost heap?) so I would think they'd only love a store of wood pellets. Terriers are, as a cat lover I'm sorry to say, rather better than cats at keeping them under control. Storm is essential though smelly when they die and rather cruel. I use it every year.
Imogen (very rural dweller)