'Guru'.
Looking at my copy of the excellent book
Ring My Bell by Frank Spittle, he's a bit vague on dates but is clear that the sport of bell target pre-dates the Lincoln Jeffries invention by quite a few years (Lord Roberts' famous 'Bisley address' about how poor the Brits were at shooting compared to the Boers, was in 1904), so we can assume that the first air rifles used were the usual Gems, Millitas etc, before the fixed barrel LJ/BSAs were adopted, even though they would have seemed incredibly expensive at the time. Often a club would share a couple of the LJ pattern rifles, it seems from the photos of the time.
I don't know which air rifles the 'British made' ones referred to were, but since the LJ rifles first came out several months earlier in mid-1905, could it have meant them? The no.3 (.25 cal) could mean the large calibre Millitas, I suppose.