Forest certainly implies that he went to school with Anquetil: I just think it's a bit unlikely. Maybe I'm overestimating the social privilege of the Foleys, but they've clearly been rich on the folly-building scale for at least two centuries and Mariners is pretty grand. We don't know if Sir Charles is a baronet or a knight (if the former the title might be a Victorian one, as Robert talks of Rupert and Humfrey, not Sir Rupert &c.) No social historian I, but I would have thought public school was pretty automatic for boys of that class, not for the quality of education, but for the social prestige.

Addendum: & perhaps the independent, unaffectionate nature of family relationships between the Foleys suggests that Sir Charles would favour boarding schools?