Members of the Association request guidance from the appropriate panel via the Secretary of the Working Group. The panel considers the request, together with any additional information and reports to the Secretary any guidance to be given. The panels' recommendations are distributed to members.

The Technical Guidance Notes, once published, are not only sent to the DTI but also the European Commission in Brussels. Currently there are 35 Technical Guidance Notes with further notes always being drafted.

An index of the topics already covered is shown below. Any member of the Association will be pleased to discuss any topic covered by a TGN.