In my experience, Castlemilk Moorits are not shedding sheep. Some CMs may shed, usually only partially, sometimes, but if you had CMs you would need to shear.
Do you find the same with yours, [member=25822]Maggy[/member], [member=590]daveh[/member], [member=3983]Brucklay[/member], [member=3211]Anke[/member] ? (I added a few folks I know have, or have had, CMs.) Maybe there are some strains that are more sheddy than others?
The breed was developed to look good in parkland, to provide good meat and also cloth for the estate workers. You'd hardly make them a shedding breed when you wanted the wool to be spun for cloth.