I don't know which countries still allow switchable headlights etc, but I guess it wouldn't make much sense for Triumph to produce a slightly different wiring loom for those, and another for the rest of us. Therefore my guess would be that the wires are there, just not the switch. The questions are really whether these wires would show up on a workshop wiring diagram, and what, if anything, are the conected to at the other end?
If they are on a wiring diagram, I guess a dealer could help?