Thanks Harry,
I did more googling and I'll bet it's an EFI fault or O2 sensor fault. I too am not a fan of "computers" but unfortunately it's hard to have a vehicle these days without all those pesky wires. I had found that parts breakdown, did see any diagnostic port on it. Oh well.
I'll have a good look over it once I can actually see it but I get the feeling that no one who rides it is too keen to spend money on it so that light will live on.