Dan the ignition is weak for sure, but it's demise is from the solder joints getting soft from more current than they can handle. The headlights should have been on a relay from the start, but for whatever reason Triumph ran the full load through the ignition switch. You can actually see the power loss from the resistance in the headlights, they have a yellow tinge to the light. The relays protect the switch, yes ... but the immediate benefit is being able to see better with the bright white light the headlights give off. I can see so much better at night now, don't even need the driving lights I mounted below the radiator now.
I had my switch fail under warranty and saw that it's not just the switch that has to be replaced, but everything that works off the key (seat release on standards, fuel cap). I decided it was cheaper to install Eastern Beaver's relay harness than pay for all that myself next time. It's all been working great to date.