A full set is not something you see often, though the scrolls, the plaque and the medals all have a value, I could not say for your family group, but the value is affected by the unit, in your case MGC, which would be desirable I think, the date and action in which he fell, did he have any other awards, did he qualify for the 1914 star or the 14-15 star or only (I hope that does not sound rude) the War medal and Victory medal. Having pictures of him also affects the value and the full set has got to bring a premium I think.
The memorial plaques were made by two different makers and the second maker made two different versions and which one he had might also affect value.
First step in researching him, as he will be listed here.
CWGC - Find War Dead
Also he should be listed here and you can find phtographs of any gravestones/memorials to him
War Grave and Memorial Photographs supplied by The War Graves Photographic Project
As a relative, maybe your wife can apply here for his service records
https://www.gov.uk/government/organi...-guard-records
Also search here for his medal index card
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