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Hello Jack..
You could have a look at
https://archive.org/details/recordsof90threg00delarich  you can download as PDF or whatever format suits...
Also you can check national archives..https://discovery.nationalarchives.gov.uk
there is a James hart listed at but note sure if this is the correct one... the above history will give you a better idea where regiment was stationed during the time you are looking at.... I do believe they served in India so you could check medal rolls at the other address below below...
https://discovery.nationalarchives.gov.uk/details/r/a7a05fb0-6bfe-4e98-9a56-650f8bc3e429
https://www.noonans.co.uk/resources/resources/medal-rolls/4/

all the best on your searches..
Regards
Markw

David 
No I have not contacted the Courier, but in town [toun] tomorrow so may pop in and ask,
Regards
Mark  W

mckha489
I will do.. very sad for my great grandmother losing her brother's so young, her father when she was 14, her mother at 15 and with two brother's to look after... must have been very difficult for her...
People nowadays no idea what people had to endure before the welfare state... .

I know what you mean about rabbit holes... I have had a few of these myself during family history research.. 

all the best
Regards
Mark W

Hello mckha489
Wow can't believe you found him under Malone... so pleased to finally solved this brick wall and as per the other certificates names all different apart from Daniel and Sherrington.. off the get from Scotlandspeople ... and bonus now have great great great grandparents names too..

All the best and thanks ever so much mckha489
Regards Markw

Hello again
Mystery partially solved ... I think...

mckha489 and Forfarian thanks again for all the leads.. running down these below, possible
Death of Daniel.......I am afraid these both were dead ends see below...

MULLEN DANIEL 42 MCMAHON M 1884 644 / 1 / 1017 Bridgeton
1884 12th Oct Daniel Mullen 42 No Relation as wife's name different Steamship Stocker

MILLEN DANIEL 44 DALY 644 / 14 / 417 KINNING PARK
1889 1st Sept   Daniel Millen 44 No Relation as wife's name different  Ship Steward   
-------------------------------------------
Regarding the DC of Dinah Mallon, this appears to be the correct based supposition, namely

Death   1883   5th April   Dinah Mallon   34   South Road [No Number]   Mary Ann Mallon (Daugther) Signed with a 'x'   Consumption (3 Months)
of Great Great Grandmother         Est Year of Birth   1849   Age at time   15

although as you pointed out the MS was listed as Haddington...but with no forenames or MS...
Given that Mary Ann appears to be quite young and illiterate she would have little in the way of pointing this error out at the time....

In addition when she married in 1889 her husbands address was 11 Union Place Lochee... and on her brother's DC she lists this address was listed against the informant..

Death   1890   29th April   Daniel Mellon   9   11 St Mary's Lane   Daniel Mellon [Labourer] & Dinah Mellon MS Sherrington   Gastric Debility, 21 days   Mary Ann Mellon (Sister) Signed with a 'x'  11 Union Place, Lochee  Est Year of Birth   1881

Also regarding the use of the name Melville..  on the marriage certificate of one of their son's my great grandfather 1927 this is listed as MS of his mother Mary Ann...

It would appear that the names changed over time from Mellon, Millan, Melon, Melville...
Looking into the Etymology of Mellon... I found this..

Mellon : 1: Irish (Ulster): variant of Mallon.2: English (Lancashire; of Norman origin): habitational name from Meulan in Seine-et-Oise now known as Meulan-en-Yvelines.3: Scottish (Lanarkshire; of Norman origin): variant of Melville.
As a Northern Irish surname, from Ó Mealláin, a name formed from a diminutive of meall (“pleasant”).

Also looked for John as you suggested mckha489 but also no luck for any marriages or DC..

So I will have to continue looking for Daniel's and John's DC when I have time to...

Thanks again for all the advice,
Regards
Mark W