Problem nowadays is the volume of traffic on that road to let any real number break over, but your probably right. We have had similar experiences over the years where you would expect them to be in a particular area but they don't really show in numbers, yet a mile away there is large populations.JR I think it is a certainty that they will filter across the A74. Here the original population in a park on Dochfour on the north side of Loch Ness managed to get across the very busy Caladonian Canal and thrive all along the south side in a matter of a few years. It is strange however that they often move through ,what seems to me to be suitable ground, and colonise an area beyond it maybe staying put here till population pressure moves them on. Yet they don't move back to the area they crossed. Something must not suit in theses areas.