Many thanks ESG
Will send you my e-mail address. It sounds fascinating - my interest was generated more by the technology than anything else. Perhaps my near 50 years in the industry would have stopped me considering their use in aircraft !!
The prime mover was the constant exposure to the increasingly prevalent blabbermouths who appear unable to exist without broadcasting their inane drivel to the passing world. A pocket borne device to stop their rabbiting appeals to my Victor Meldrew side !!