What i really wanted to ask was, in Archival washing of prints which are to be toned in eithe selenium or indirect sepia (FB in particular) is there any point using an HCA with an Alkaline fix like tf3 or tf4?[/QUOTE]

no you don't have to use an hca with an alkaline fixer,in fact an alkaline fixer is better if you want to selenium tone your prints as this toner prefers an alkaline enviroment. I would recomend using a hca after selenium toning as selenium toner has a small amount of hypo in it.
hope this helps