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Two John and Elizabeth Smith's recorded deaths, whose ages similarly compare with Their birth years are ;

John Smith (No middle initial)
Age: 70
Birth Year: 1838
Death Year:1908
QTR: 2
District: Burton On Trent
County: Staffordshire
Volume: 6B
Page: 215

Elizabeth Smith
Age: 67
Birth Year: 1847
Death Year: 1914
QTR: 3
District: Burton On Trent
County: Stafforshire
Volume: 6B
Page: 458

Alternatively;

Eliza Smith
Age: 78
Birth Year: 1847
Death Year: 1925
QTR: 1
District: Burton On Trent
County: Stafforshire
Volume: 6B
Page: 480

 If one opens a 'Read Only' Word Document, the trick is to 'Save As', and rename the File Document, in this case on Your Tablet. When the re named File is re opened, it should now be Editable.

On Your Desk Top, You probably have the Word Documents set as 'Read Only', when they are Emailed. This can be reset, to remove this option.

https://support.microsoft.com/en-us/office/make-a-document-read-only-5c25909c-46d9-4eb0-9d1f-d072a560e340

https://www.familysearch.org/wiki/en/Egypt_Colonial_Records

You may have come across the above Link already, and it's a long shot whether it has any further useful information for You.

I assume the recorded information on the GRO Certificate, was taken from the Public Health Department (Notice of Death?) Certificate, dated 5/1/1937 in Egypt, and this original was produced as evidence for compilation of the UK Record. Perhaps the cause, and date of death, was not recorded on the Egyptian Certificate.

With respect to His Service Record, it might be worthwhile contacting the Colchester Branch of the British Legion, to enquire if Donald was a Member, and if so, do They hold any information on Him.