Marriage lookup - Thompson & Sheppard

[Jokdy]

I'm not sure if this is the correct place to post this so please advise... 

I've found out my great great aunt Helen married an Irish fella and I've found his family on the 1901 census in Glasgow as follows:

9 Fraserbank, Maryhill

William Thompson 39 (soldier - Royal Inniskilling Fusiliers)
Robina Thompson 41 (nee Sheppard)
John Thompson 19 (my guy - marries Helen Dewar in 1901)
Herculus Thompson 17
Robert Thompson 16
Sarah Thompson 13
James A Thompson 9

All born in Ireland with exception of James who was born in India.

Is anyone able to find the marriage of William and Robina for me? 

Robina's death extract has her parents down as Hugh Sheppard and Martha McLean.   

[culbaire]

A Robena Frazer Sheppard married a William Thompson in the Londonderry Registration District April-June 1881

[kingskerswell]

Hi,
   Possibly same marriage but William Thompson married Rebecca Frazer Sheppard in St. Columbs Church of Ireland, Londonderry City on 19 Apr 1881.
Aso Hugh Sheppard Married Martha McClean on 23 Mar 1846 in Killowen Church of Ireland, Coleraine, Co. Londonderry. This couple were having children in Londonderry City in the 1860s
Mary 5 Feb 1865
Martha 29 May 1867
Allan 12 Oct 1869

Regards