This probably nothing, and even if proven i've no idea where how it helps, but desperate times call for beer desperate measures.
remember the June 1915 wedding cert for Thomas richey and Emily Wood
well, the witnesses were
Robert Young
Frederick Maret (could be maset,but unlikey)
so, I ran a search on Frederick Maret and two things eventually matched up;
1) a Frederick Maret married Ap/Ma/Ju 1875 Strand,London 1b 858. that's our Thomas Richey's place of birth and familys pivotal area for decades. Our Richey would be a kid at the time.
2) a Frederick William Maret is discharged from the 7th London Rgmt in June 1915. that's the same Rgmt Thomas Richey is in at that time!
Now way at all of confirming any link between the two Marets (same guy or not?),or either with Richey yet, but I've got my nose to the ground in hope of a lead.