I've mentioned it before so I'll mention it again. In the Imperial War Museum Review No.6 there is an article "Professionals and Specialists: mining on the Western Front" by Bryan Hammond. He mentions the use of cut down SMLE's by the mining companies and gives a ref: A rifle of this type is illustrated in the Visit Diary of First Army Controller of Mines. PRO WO158-137. It was principally for the use of listeners in forward listening posts. If someone could pop along to the Public Record Office at Kew Gardens and dig it out we could all see the picture!