We saw the signs on one last weekend so rounded them all up. In fact the ewe in question had a cut which was attracting fly attention but the Clik was doing its job and preventing an actual strike. We haven't had a bad summer for flies but they're all over the place at the moment, so pretty pleased with Clik. Still keep a supply of Crovect in case though.
We took the opportunity to crutch them ready for the ram, manicure their nails etc. I mentioned this to a colleague without being too descriptive. He looked puzzled so I likened it to to a Brazilian and he nearly choked...