I have found some macros on the internet which may help:

This macro finds each table in turn:
Sub FindTables()
Dim iResponse As Integer
Dim tTable As Table
'If any tables exist, loop through each table in collection.
For Each tTable In ActiveDocument.Tables
tTable.Select
iResponse = MsgBox("Table found. Find next?", 68)
If response = vbNo Then Exit For 'User chose to leave search.
Next
MsgBox prompt:="Search Complete.", buttons:=vbInformation
End Sub

This macro deletes any rows with a blank cell in the first column:
Sub DeleteRows()
Dim TargetText As String
Dim oRow As Row
If Selection.Information(wdWithInTable) = False Then Exit Sub
TargetText = InputBox$("Enter target text:", "Delete Rows")
For Each oRow In Selection.Tables(1).Rows
If oRow.Cells(1).Range.Text = TargetText & vbCr & Chr(7) Then oRow.Delete
Next oRow
End Sub

If anyone could modify the second macro to delete any rows with a blank cell in the third column and then nest it within the first macro to enable multiple tables to be amended, I'm sure that would solve my problem. I wish I was better at VBA to be able to do this for myself.

Thanks in advance if anyone can combine those for me with that slight change to the second macro.