I used to deliver the mail to all the farms and cottages in this area back in the late 80's. Spire Farm (or New High Riley Farm as is was known postally) was split up into at least 3 properties around that time as I recall. Spire farm is the wrong side of the by pass to be associated directly with the Kings Highway.
The Kings Highway starts (so far as Accy is concerned) near Windy Harbour farm above the Easterly By Pass cutting and runs over Moleside Moor. Properties likely to have land adjacent to it are:
Miry Lane Farm, Slate Pits Farm, Moleside End Farm, Blue Slates Cottage and West Farm. "Traditionally" many resident farmers view visitors with, shall we say an air of suspicion
. The highway continues over Black Moss, through Stonefold village and then through Sherfin at the back of Winfields. Thats where my connection ends but I understand that in it's original state it was a drovers road between Lancaster and Manchester and not quite as old as some might think (just how true that is, I don't know).
Ian