Best of luck with your little sheep Burrwoodfm
It's worth mentioning in this thread that some breeds of sheep are particularly sensitive to copper, while many
need copper supplementation.
The whole of the UK is copper deficient; I'm not sure if some are more deficient than others, or all much of a muchness.
Copper is needed by sheep to thrive, and specifically and especially by pregnant ewes to develop the foetal skeletal system; lambs which were copper deprived in utero can be born with or develop swayback, as their skeleton is not strong enough to support their growing bodies.
Many general purpose sheep mineral drenches contain copper; copper is also often present in sheep feed and can be administered by injection, bolus, capsule or other medical method.
Too much copper is more dangerous than insufficient. Some breeds of sheep are naturally adapted to manage with no additonal copper and can be poisoned by being given dietary or medicinal copper. The most well-known such breed is the Texel.
Much higher levels of copper will be present in cattle feed - generally enough to poison most sheep if eaten routinely or to excess. Many cattle licks will also contain copper at levels which would be dangerous to sheep.