After some very helpful advice from this Forum, I contacted Middlesbrough diocese and asked about Admission records for Crossbeck convent (North Ormesby) as I am trying to trace if my grandmother was there in 1922. There are only admissions records going back as 'from 1922' I did find her in the 1921 Census as 'a boarder' aged 12 at a house in Oxford Street, Middlesbrough. The response from the very helpful archivist at the Diocease was "In terms of our records, the North Ormesby collection is unfortunately closed to public access until 2037 due to restrictions in place as a private archive. As for the Crossbeck House collection, it is accessible, but this collection primarily documents major events, like professions and annual celebrations, rather than everyday visitors or personal encounters".
I am almost certain that my nan was at the Convent (from other information I have discovered). She died in 1969, so I find it hard to understand why there is no public access for another 13 years !!! It will be too late for my own mum ( who is 90 years old), to know if her mother was taken there & I certainly will be far too old to even remember I had made such an enquiry ! I really dont know if there is anything further I can do to 'complete' my jigsaw.