The 'Groupsave leaflet' is the 'notice and publication' and you can pick it up at any station in the area.
It is an
ATOC» publication I think, like all the railcard leaflets, and clearly lists all the
TOCs▸ it is available for.
The web version of the T&C is as follows, I expect the leaflet is similar:
Full terms and conditions are available at the station ticket office. Prices shown are available from 2 January 2010. GroupSave fares are based on all people travelling together at all times and cannot split from the group to travel separately. Failure to do so could result in a penalty fare. Participating Train Operators in London and the South East are: c2c, Chiltern Railways, First Capital Connect, First Great Western, London Midland, London Overground, National Express East Anglia (excludes Stansted Express), Southeastern, South West Trains and Southern. GroupSave 3 is available for combinations of 3 adults; 2 adults and 1 child; 1 adult and 2 children. GroupSave 4 is available for combinations of 4 adults; 2 adults and 2 children; 1 adult and 3 children; 3 adults and 1 child. GroupSave is valid on Off-Peak Day Returns for return on the same day, where available. GroupSave is valid on Off-Peak Day Travelcards for travel only from stations outside of the London area (not for purchase in the London Fares Zones 1-6). GroupSave is valid on Off-Peak Returns for return within one calendar month, where available. Travel on First Great Western may not be available on some busy peak days - please click here for further details. Travel time and date restrictions apply. Participating Train Operators in London and the South East offer a special ^1 flat fare for additional accompanying children. Prices shown may be subject to change so please check at your local station.
I suppose the pedantic view is that there should be two lists, one of valid TOCs, and one of the remainder.
IMHO▸ the rule is clear enough, but
IANAL▸ ...
Paul