Hello Julezz61d
Welcome to the forum.
You mentioned your GG Grandfather was recorded in the newspaper regarding his service in the Electrical Field Engineers? What date was this article? Also, if Charles had served in the Boer War he would have been aged 39, and 54 for WW1. Do you have any more information regarding his military service? Could he have served in a Militia ? ( ref picture 3 white spiked pith helmets)
With relation to picture 5, I assume your G G Grandfather is in the middle row ?
Is he the Sergeant wearing medal ribbons ?, does the family have his medals? The cap badges in the same image are also intriguing, they do not look like the rising sun cap badge in my opinion.
The images you have posted certainly look WW1 reference the uniforms. Picture 1, ref the ship and sailing to South Africa? I have had a trawl through the naval ships for Australia but no HMAS with that name was forthcoming. I did find a HMS Vulcan which was a British torpedo boat depot ship launched on 1889 and served in the Mediterranean circa 1901 then in 1909 which was used to support submarines.
HMS Vulcan was a floating dockyard. As a cruiser and fighting ship, she mounted 20 quick-firing guns and torpedo tubes; as a repairing shop she was fitted with lathes, drilling, planing, slotting and punching machines, circular saws, workshops and smithery, forges and furnaces; as a torpedo depot, she carried on board large supplies of torpedos, torpedo stores, mines and mining apparatus; as a floating dockyard, she contained a small flotilla of torpedo boats with cranes for lifting them, as well as all sorts of special appliances. Her raison d'etre was torpedo nurse and general repairing establishment afloat for general service. The lifebuoy in your image is named Vulcan, with what looks like C or S Engineers, it could be possible your ancestor was aboard in an engineering capacity? However, more research required and assuming it is the right ship.
With reference to Electrical Field Engineers? It is my understanding that the Imperial Forces engineers during WW1 were numbered Field Company Australian Engineers.
Dave........
Ps......1914 records a Charles Thomas Nicholls as being a Teacher in Ballarat. Is this your G G Grandfather?