Hi Tony,
I have just put 4 posts on the West Yorkshire Site showing a Grassington School Photograph from 1914 with most of the children named.
There are 3 Harkers named but I do not know if they are relations. Also your names Cardus & Carradice are ringing bells but I do not know why. I will look through my stuff & see. Very interested in the Harkers of Grassington so would love to know what you know.
I think Cardus was a name on the back of a dales postcard. Is there a dales connection?
Will get back if I find anything related.
Update: I had provided some photographs for the Save Kettlewell School Campaign & William Carradice was a teacher at the school. In the 1901 census it shows that he was born about 1862 in Hellifield, Yorkshire.
Also I have a trade card for the Temperance Hotel in Appletreewick, Yorkshire which is undated but states that F.H.Cardus is the proprietor.
Regards
Ben