Illustrated above are some of the rooms. From the top downwards they are: the dining room, then one of the classrooms (this picture is a drawing), and then one of the nurseries; there were separate dormitories for older girls.
Incidentally, in case you were wondering, Blencathra is the name of a mountain in the English Lake District.
MON 12th APR 2010 UPDATE: Before WW2, Rhyl's private schools tended to move from one building to another to suit fluctuating student numbers and other business considerations.
For a while Blencathra was in The Grange, East Parade; the upper floor was the games room. In those days The Grange was named Moranedd.