Hi Lucy, there seems to be some confusion as to ticks (ixodes ricinus) and sheep keds(melophagus ovinus) they are two seperate species.I have often seen keds in shetland but never ticks. I have seen a dog picking up a lot of ticks on its coat after running through deep heather and bracken, near Rackwick on Hoy, Orkney. Good luck with your search,cheers,Peter.