After a recent transfer of our server, ownership (and thus access) of newly created files was being assigned to the creator. Old files could still be accessed by members of the group. It seems the solution to this was to use Workgroup Administrator to change the AFP sharepoint so that it used “Inherit permissions from parent” rather than the “Standard POSIX behaviour” (which in standard UNIX style is probably more secure but less useful 
Fortunately this seemed to work so I didn’t have to enable and implement appropriate ACL’s
Newton’s Lore
MacGeekery at its finest!
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JoyOfTech
