You are not mistaken Glenn,
BATTMAN is an express tool that does what I required, however... there are several thousands (approx 10 DWGs min per project, each with 14 min layouts, for each project dated start of AutoCAD - 2009) of the DWGs which have incorrect Tag, each with the reference block actually binded to it. I first looked at
BATTMAN and using the sync function, but that didn't work to great.
I use this function to fix and uniform tags to construct filenames for PDF, with the intention of converting each area of these titleblocks (model and layouts) to PDF for archiving into a Database.
I seem to remember an express tool (which I believe has been incorporated into core functionality) called BATTMAN...from memory it appears to do what you want...or am I mistaken?