The ICAO documentation was where the ATSOCAS working group started from. However, the provisions within ICAO allow the full range of options to be provided under the term FIS, including avoiding action. This did not accord with the Statement of User Requirement (SUR) that called for distinct service levels that were clearly defined and constrained. Therefore, it was not possible, practicable or desirable to simply adopt DOC 4444 principles (which are guidance not regulation) within class G in UK airspace. This was briefed and discussed at the Industry Workshop held on 8 May 07 and was agreed that the principle of adopting ICAO in total would not work for the UK.
Following the workshop the working group also considered what was done in other European countries and also the US. It was shown that there was no common standard for the application of services outside controlled airspace within Europe or between Europe and the US. Therefore, whilst the UK could have adopted one of the models, in actual fact it would only have standardised the UK with one other country and in reality none of their models actually answered thre requirements of the SUR.
However, to achieve greater compliance with ICAO the new suite of services will come under the overarching banner of FISs as desccribed in the RIA. Therefore, rather than 'not listen' I think it would fairer to say all avenues identified and suggested were explored, but at the end of day not everything people suggested proved to be pratical or implementable.