Alan.. I think I have scared immunity syndrome now..
The motor bikes here turn off their lights at night because they think they save petrol!
Just missed an oncoming one a few nights ago as I was overtaking a multicab..the motorcyclists passenger was carrying a metal frame 6ft X4 ft so in effect he was about as wide as the multicab I was passing..
No lights of course...you just couldnt make this stuff up!