When to shear is always a balancing act. Colder weather forecast here for Friday so best to leave the ewes at least - they can't make milk and keep warm too. When it comes to flystrike watch for lying away from the flock, small, jerky movements, licking lips, nabbing at rear. Also watch for flies buzzing around them - once one lot hatch the other flies pile in. Really hard one to spot is when the fleece is really wet and has some fleece rot and the flystrike is in a sort of "mayoral chain" ring around the neck and brisket.