Thanks to all for the input and info'.
Mirrors would be my first choice too as I've used them in the past. Sadly, if a chin mirror is fitted to the aircraft I am currently flying (Mk1 Super Puma) the nose floatation bag is obstructed by the mounting structure and the aircraft cannot be used for offshore op's IAW my Op's Manual hence the camera question.
If I could source an after market mounting that didn't compromise the flotation system I'd go for it but I haven't had any luck so far.
I'm still keen to have a look at the camera option so if anyone could provide me with the name a manufacturer who produces approved kit for the commercial market I'd be grateful. I also understand that vibration can be an issue if the camera is mounted on an extremity of the airframe. I suspect glare on the screen won't be too much of a problem as I'm based in Scotland where I'm more likely to have snags with the lens icing up!
Cheers,
MM