Muzzy69 - I like the photo of them all displaying their Kings & Queen's South Africa Medals. I note on the FT you have created on Ancestry you appear to have identified your Great-Granfather as third from the right in the middle row.
The info supplied by Dave F shows he previously served in the 4th (Militia) Battalion of the Royal Irish Fusiliers. His 3 December 1890 Militia attestation papers can also be found on Find My Past - you will note that on this occasion he was economical with the truth regarding his age. You will also note his service/regimental number changed when he transferred to the regular army.
Above is the first and most interesting of the three pages.
He can be found on medal rolls on Ancestry - do a military search and put his service/regimental number 4168 in the Keyword box and he should come out top two - one for his Queen's Medal and the other for his King's Medal. You should be able to attach both to his profile in your FT.
Regards, David.