That's a very nice webpage. I had a hunt a little to find it, so here's a direct link: http://wilkinsonfscollection.com/wilkinsonfscollection.com/The_Lee-Speed_Rifle_Sporting_Pattern.html

There are other photos of officers armed with "Lee Speed" rifles. 20 plus years ago I saw a pair of photos of the Bulawayo Field Force at the Maputo Hills. One of which showed four of the officers seated behind a wagon, with at least one Lee Speed sporting rifle in both photos. The photos went to the National Army Museum in Chelsea, but are not in their online photo index it seems. You could email them and ask.