Originally from: Bill
                        
I'll go along with Mark Purdey in that the problem is most likely nutritional. The sheep came from Derby (limestone soils) so maybe there is a possibility of phosphorous-calcium imbalance.

Phosphorous-calcium imbalance causes a serious muscular condition called hypocalcemic tetany (colic type pain), excessive calcification of bones and tissues (laminitis), constipation, nausea, hyperactive stomach, and bloating.

There is also risk of kidney problems (stones for example), and cardiovascular disease due to calcium deposits in the blood vessels. Other possibilities are vomiting, itching, skin rash, nausea, arrhythia, bone pain, myalgia, and increased urination.

Kind regards,
Bill.