The Tories might not have been quite as keen either. One of the things that is very evident about the outbreak of WWI is that practically no-one in the political class anywhere in Europe understood just how costly in terms of life and treasure the War would be, even including anti-war liberal and socialist internationalists, who were acting on moral grounds not (in the main) superior understanding. Two visionary thinkers had some awareness, a Jewish banker from Warsaw (called Bloch if I recall correctly) in 1899 and a British left-wing journalist, Norman Angell (around 1912 or 13). Sadly neither were widely read prior to 1914-18. By 1915/1916 WWI might not have been exactly an attractive proposition for a neutral power that would have been (presumably) economically booming on sales of goods to both sides and a rearmament programme at home. "Preparedness" rather than "Have at them!" I would imagine.