is it too big to be helmet mounted?

depends on how big your helmet is

No, bit heavy until you get used to it but fine once you find the right balance point.

do you mean the cycle specific lamp with remote battery?

I've just received one of those & it definitely is light enough to mount on a helmet. I'm not sure if the cable would be long enough to reach from a back pocket though…

Lamp seems good so far generally, though still new enough for me to being keeping fingers crossed.

I was referring to the torch.

i mean the bike specific one – any chance of a photo at the side of your BIKE helmet please?

Forget that, thought you were talking about the torch 😐