Thanks Mike and Adrian, much appreciated. So I guess Stirling was out by one day when he mentions the 6th January.
A little side story about O'Hagan - this is an anecdote written in 1901 and quoted by his mother after his death:
"At the same time 50 or 60 of the I.L.H. were laid low by the enemy’s bullets. While O’Hagan, along with the rest of the dead and wounded was lying on the ground a big Boer started to rob the helpless men. O’Hagan saw this, and, having a revolver in his possession, he fired at the Boer, and put four shots in his leg between the knee and the hip, the robber falling beside him.
In due time the wounded were removed to the Johannesburg hospital. The Boer’s leg was so badly shattered that it had to be amputated. O'Hagan's injuries affected his spine, but he was soon about again, though he was unable to straighten his back, and walked about almost doubled up. On getting about his first inquiry was as to the whereabouts of his former rival, the Boer. He soon found him, and every day O'Hagan was to be seen making his way to the wounded Boer’s tent, and quite a warm friendship sprang up between them."
Cheers
Phil