Possible Catholic Boarding Schools in 1851?

[Spiral]

I am looking for John Anthony Mastaglio in the 1851 census. He was born about 1837 in Newcastle-upon-Tyne and dies in 1895. I have found him in every other census and I have also discovered the rest of the family in the 1851 census.  So where is he?
Given his age of 14 I suspect he may be at school as his father was a successful trader and could afford to send him. The family were devout Catholics and so I wondered if there would be any Catholic Boarding schools at this time which I could trawl through name by name as the name Mastaglio is often transcribed incorrectly even on the few occasions that it was originally recorded correctly.

[Milliepede]

What trade did he have later on?  Could it be he was an apprentice to someone at 14 and is in their household 

[Milliepede]

What about son Joseph in 1851 - where was he?  (19 in 1861)

[Spiral]

John Anthony works in the family business of importing "fancy goods" and manufacturing furniture and then takes it over only to go bankrupt (together with brother Joseph) in 1883. It is possible that he was apprenticed to a jeweller or even travelling back to Italy. In 1851 Joseph and Vittorio are staying at their Aunt's in Felton.
I am investigating the history of catholic schools in the area but most seem to be elementary level only.

[KGarrad]

The only one I am sure about is the former St. Stanislaus College, Beaumont, Old Windsor.

Much later it became a training centre for ICL (computers), and I attended some courses there

https://en.wikipedia.org/wiki/Beaumont_College

[KGarrad]

Other colleges formed by The Society of Jesus (Jesuits) include:

Liverpool (1842),
Spinkhill (1842),
Glasgow (1857),
Beaumont (1861),
Preston (1865),
Grahamstown (1876),
Malta (1877),
Georgetown (Guyana) (1880),
Wimbledon (1893),
Stamford Hill (London) (1894),
Bulawayo (later moved to Harare) (1896),
and Leeds (1905).
Campion Hall was founded at Oxford in 1896.

There may be other orthodox Catholic schools and colleges?

[arthurk]

Ampleforth? Stonyhurst?

There's another list at https://en.wikipedia.org/wiki/Category:Catholic_boarding_schools_in_England

[Maiden Stone]

Have you tried the Catholic Family History Society? It has various publications and a blog.
There's a publication called the Catholic Directory which includes/included Catholic schools. I don't know when it began publication. The Catholic Church in England was reorganised into dioceses in 1850. Name of diocese may have been Hexham & Newcastle.
If he was at boarding school in England in 1851 he should still show up on a census.
Arthurk's suggestions are the 2 which sprang to my mind.
Edit. The Wikipedia list is modern but some schools on it existed in 19th century.

[Spiral]

Thanks for the suggestions - I will look into the Catholic Family History Society.

I am assuming that if he were at school that I will be able to find him but experience has shown how differently the name can be transcribed. I have already gone through Ushaw College in Durham, Spinkhill and Stoneyhurst. Ampleforth is next on my list. 

I am searching the northern area first and also around Sheffield as I know the Mastaglios had business interests there. I suspect that it will not be one of the major schools though.