Both of those opened for me Bert thank you and I believe that has linked the two heroes. It has disproved the entry for the 1911 census for the older Samuel as I have the wife incorrect so I will remove those details, but will keep the entry for the Soldiers who died in the Great War, although the two numbers are different the death date is the same, could he be one with two different numbers?
well perhaps somebody else could give an opinion on whether that entry is accurate.
We need the Du Ruvigny's Roll of Honour in this post for completeness so I will type up the two entries and also the photograph.

GERRARD SAMUEL, Corpl., No. 83111, 42nd Battery, R.F.A., 2nd s. of the late Archibald Gerrard, late Corpl. 14th Buckingham Regt., who served 10 years with the Colours, and 22 years in the Reserve, by his wife, Elizabeth, dau of Phillip Stone; and uncle of Private Samuel Gerrard and Private Thomas Gerrard (q.v.); b. Glasgow, 3 Oct 1869; educ. St Mary's School, Edge Hill, Liverpool; enlisted in June, 1891; took part in the South African War 1899, including the Defence of Ladysmith, and actions at Elandslaagte (Queen's medal with two clasps); served 11 1/2 years with the Colours, being then discharged as medically unfit for further service, but re-enlisted in Aug. 1914, after the outbreak of war; went to Newcastle, and died there 9 Oct. following from pneumonia, contracted while on service; unm.
GERRARD SAMUEL, Private, No. 3522 1st Battn. Irish Guards, 4th s. of Philip Gerrard of 41, Milroy Street, Wavertree Road, Edge Hill, Liverpool, Sergt., Royal Defence Corps. by his wife Jane, dau of Stephen Stone, of Castlecomer; and nephew of Corpl. Samuel Gerrard, and brother to Private Thomas Gerrard (q.v.): b. Edge Hill, Liverpool, 10 May 1893; educ. St Mary's School there; enlisted 12 April, 1910; served three years with the Colours and joined the Reserve, during which time he was employed as a Storekeeper by the Mersey Docks and Harbour Board; was called up on mobilization 4 Aug. 1914: went to France about 12 Aug., and was killed in action at the Battle of the Marne 8 Sept. following. A comrade wrote: "One of our men received a bullet in the stomach and called out for a drink; regardless of the German rifle and shrapnel fire, your son took his water-bottle and held it to his comrade's lips. It was impossible for him to do so without exposing himself to a terrible fire; therefore he met his death as an Irish soldier should meet it, for he knew it was certain death to do what he did." His other brothers: Private Archibald Gerrard was called up from the Reserve on the outbreak of war and after being four times wounded, was discharged as medically unfit in 1916, and Drummer James Gerrard is in the Scots Guards, while his uncles Private Archibald Gerrard, King's Own (Royal Lancaster Regt.), served in France from Aug. 1914 to Oct. 1915, when he was wounded and lost the sight of his right eye and the use of his right arm, and Lieut. and Quartermaster James Gerrard, 15th Highland Light Infantry, is now (1918) on active service in France; unm.
Sorry that there is not a photograph for this hero.