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I have the following -
A Members Table called 'Members' with ....

  * The Key being 'RecordID'. INT, Auto,
  * Plus the rest of my 70-odd fields..........  (This table comes up
in my "Main Form")

70 fields in one table? Sounds like this database may be de-normalised:

http://en.wikipedia.org/wiki/Database_normalization
 
I have now added another table called 'eMail' which has .....

  *   The Key being 'MessageID', INT, Auto
  *   Plus the rest of the fields for Date, Type, Title and Message.
    (All TXT)
  *   The final Field is called 'MembersID', INT, NOT Auto,

You mention a "Foreign Key' which maybe the answer to what I'm trying
to do but how do I declare the RecordID/MembersID Relationship?

http://en.wikipedia.org/wiki/Foreign_key

The Libreoffice Base handbook hasn't been entirely translated yet:

https://wiki.documentfoundation.org/images/b/bb/BG3401-IntroducingBase.pdf
https://wiki.documentfoundation.org/images/6/65/PlanningDesigningYourDatabase_DEL_20120809.odt
https://wiki.documentfoundation.org/images/0/06/Data_input_and_removal_DEL_20121106.odt

Sincerely,

Wolfgang

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