When just the Victory and War medals were awarded (due to the recipient not qualifying for the star) they are referred to as "Mutt and Jeff" which is another cartoon reference.
The idea that these belong together as mentioned above is not an issue as I am sure Pauscoot knows because this is not a group to one soldier. The name on the medals (I pressume all three are the same recipient) and the death plaque are different albeit the same regiment. Plus none of the soldiers in the pictures seem likely to be either recipient (unless transferred from a corps to the infantry which is not unheard of). The single soldier is wearing what looks like the Army Service Corps cap badge whilst the group of three seem to be Royal Engineers. It would be nice to find out if the "Services Rendered" badge relates to the medal recipient (these are researchable) as that would show he survived (it can't relate to the death plaque recipient as he clearly didn't).
A very nice catch and certainly room for some research in several directions. Let us know if you do find any info!
@ Paulscoot. You got a real bargain here as I am sure you know. Just the death plaque alone complete with cert and envelope would cost much more from a dealer.