Hi, I think I've solved it! My SQL was:
INSERT INTO tbl_Notes ( Date_Written, Notes, URN )
SELECT Date() AS [Date Written], [Forms]![frmSearch]![AddNoteBox] AS Notes, [Forms]![frmSearch]![URN] AS URN
FROM tbl_notes;
I've now removed the line 'FROM tbl_notes' as it was superluous and hey...