Hi to all those who have helped with this.
Salem Cottages have now been identified. I contacted the Local Resources centre at Bushey Museum and received the following reply;-
"They were on Sparrows Herne rather than Clay Hill – on the south side, about halfway between the war memorial on the corner of School Lane and the old police station. There were eight cottages, presumably a terrace, and like the Black Cottages the other side of the police station, I would imagine they were pretty basic. They were demolished in about 1960 and replaced by a modern block of flats. "
Have checked Google maps and pinpointed the place.
Both mysteries solved. Now - time to move onto the next item on the genealogy "to do" list.
Thanks again
jjq