Had a look at the main dipped beam switch, looks fine. Stripped all the cockpit fairing panals, push and pulled
the various parts of the wiring loom all looked OK, re-checked the bulbs and fuse - all ok.
Removed and re-seated all underseat relays.
Put it all back togather and re-checked again - still no lights !
Phoned local Triumph dealer for suggestions - no joy other than what I have checked - tried to book it in - but they cannot look at it untill next month !
This morning set off to work as normal - still no lights - arrived at work and the lights now work !
Sounds like possibly a loose connection somewhere - watch this space !