My thanks to Jim and John for their advice which has enabled me to transfer data from RootsMagic to TMG. Unfortunately however not all the sources have been transferred and those that have are all described in the footnotes as books whereas in the Source List they are correctly Books, Census, Parish records etc. Also the details for every person contains the tag line *GEDCOM _ _ _ unknown Gedcom tag: _UID.
Further advice would be very much appreciated
Thank you
Arthur