Things to look out for: small, sudden movements, trying to rub head, shoulders or tail against a fencepost or similar, putting head down suddenly then moving off, trying to nibble at foot or tail, flies following an animal, separated from flock, doesn't come to the bucket, damp-looking patch on fleece. If a sheep has flystrike in the foot check the place on its body where the foot goes when it's at rest - they often transfer across. Our present regime seems to work and we haven't seen flystrike for many years. Before that we used to find the maggots then get out the shearing kit and shear a large circle around them, moving inwards to stop maggots escaping into the fleece. We used the traditional mix in these parts - a 1 litre washing up liquid bottle with a centimetre of Jeyes fluid in the bottom, filled up with water. This irritates the maggots enough to make them try and exit the wound as well as cleans the wound itself. No stronger, though, as it would then be too painful for the sheep. 5ml of Alamycin LA for anything but the smallest area of strike.