I'm unsure if this cleanly fits - but if by training Q means in rationality, "certain organizations beyond Britain's shores" could be referring to CFAR. A case for this not fitting is of course that CFAR does not exist in 1992.

I can't now think of other (real, this world) organizations which fit the phrases of training, old enough, beyond Britain's shores, letters of recommendation, and be something EY would reference.

Otherwise it would be a gesture to an implied larger magical world. But that gesture itself seems...unnecessary, beyond implying that Q considers the future education of his students important.