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Here is a blog post from 2006 that identifies Cochrane as
Hon. Cochrane (later to become Lord Chochrane [sic] of Cults)
So it appears his full name was "Thomas George Frederick Cochrane, 2nd Baron Cochrane of Cults"
Sorry nothing on Mr. Marriot so far...
Edit: Here is another source, this one identifying TGC as "later Lord Cochrane"