I'm going to think of them being in that meadow too, Lynn.
Lowlander, we've had Soay for 5 years now and so far we have had few problems. Normal stock fences but we do have good thick hedges on most sides in addition. There was only a hedge as a boundary to one paddock and the farmer who owns the adjoining field checked all my boundaries for me before we bought our flock to check that they were good enough. He thought they were. The hedge contained them for the first few months but they did on one occasion get into his field. His wife spotted them and told me (they had only been gone for a morning). I just shouted and they all came running home! Hedge now has a fence behind it.
The lambs are so tiny that we did have to check all the fences for teeny gaps. Once all secured we have had no problems and the lambs of the commercials around here are always out on the lane so I guess all lambs squeeze out where they can.
I can understand that Lynn's sheep became 'wild' as they were gone for a long period .... same can happen to 'pet' cats ..... as I found out not long ago
but in general we have found that Soay do not deserve the reputation that they have.