FL50r Remote Flash
Many thanks for the advice.
I've set the signal to Hi and that's seems to have resolved my problem.
I'm not sure if battery drain is a separate issue, I'm using 2500 & 2900 re-chargeable batteries that haven't given problems in my Nikon SB's.
Uning an SB as a Commander on the OM-D is something I'd not even condidered I'll give it a go and see what happens.
Once again many thanks.