As is indicated above by Mars, a definitive paper can be found at the following address:
http://www.caa.co.uk/publications/pu...ls.asp?id=1094
The paper was produced (as can be seen in the CAA preamble) as a result of work that was being undertaken to assess whether the JAA/CAA should produce a technical specification for EBS (at that stage we were worried that passengers might be exposed to risks from the use of this equipment which was being worn at the behest of the oil companies). The majority on the committee considered that a specification should be produced but the CAA took the position that to do so would open them up to a business risk.
As finance and technical expertise was being provided by the CAA, it was difficult to proceed and produce the specification without them.