We never made it past the first steps of Stage 1. We got close to the farm yard and were then asked by the farmer to turn back as apparently our dog (on the lead) would scare the lambs away....

Even after explaining that we would stick to the edges of the field and keep our dog under tight control, we were still denied any access.

So yeah... apparently dogs are not allowed on this walk during lambing season as according to the farmer the whole glen is full of sheep.
A shame, as I was really looking forward to this walk...