Just some clarification.
I have set up the links on page
<a href="search-index-results.php?filter=A">A</a> | <a href="search-index-results.php?filter=B">B</a> etc
The recordset on the search-index-results.php page... what do I put in the space marked in red? See attached. do I put filter= ,leave it empty or.....?