Hi Tom
If you have his attestation papers from Findmypast - its series WO96 - and it does not mention him going to South Africa, then he would have only done an initial 7 weeks training on enlistment, followed by six summer camps of about 6-8 weeks each. As there was no general mobilization again until 1914 that is the only service he would have seen.
Militia Attestation Papers are unique in that they give the recruits address, and name and address of last employer. NCOs were sent to check, as it was a condition of joining that the recruit had lived in the county for at least 12 months. Ones from 1901/2 start to give next of kin.
While serving the Militia were paid the same as Regular soldiers. Because of the training it only suited men in casual work. Men in regular employment joined the Volunteers instead.
During the Boer War they added two regular battalions to the Liverpools. These replaced the Militia as 3rd and 4th Battalions, and the Militia became the 5th and 6th Battalions. After the war they reverted to 3rd and 4th.
Added... his enlistment would have only lasted until 1908. So he would not have been embodied for WW1, unless he joined something else. The Militia became the Special Reserve in 1908. They carried on with the Militia numbering scheme. The only thing that changed, apart from the name, was that the SR agreed on attestation to serve overseas.
Ken