[IanA]

Driving through some very wet weather the other night, the dipped and main beams all became inop at the same time.
The sidelights all worked, indicators/hazards all OK and I got home using the front foglights.
The main beam blue dashboard light worked OK but nothing to light the bulbs.
Thing was- I couldn't find any common connection, fuse or relay that would account for this.
I replaced the light switch with a known good one- no change.
Yes it was the bulbs. All four filaments blew at once. What are the chances!!! All OK now.