Patrick, we took on board voice picking/selection process 2 years ago, our system installer provided us with a very detailed information pack and also how to regulate the level to ear, we also looked at hygiene issuse with these units, eg clensing wipes for use following breaks, replacement foams, clean area for storage etc, i conducted a very detailed assessment with a variety of control measures implemented, I also asked our local EHO on a site visit of their experience of these types of units and assoiacted risks, bearing in mind they visit lots of different sites where these systems were in use. Basically they said our approach was OTT compared with other companies. however we have still stayed with the findings of the R/A.