[TYPO3-english] Indexed search pagination broken (cannot move beyond p1) Typo3 v6.2

[Sara]

Hi,

Despite upgrading our installation from 4.6 to 6.2 the indexed search results pagination will not move beyond p1. Clicking on any other page just takes you back to p1.

This is using the simple search form:

 <form name="tx_indexedsearch" method="post" action="index.php?id=6729">
    <input type="text" id="tx_indexedsearch[sword]" name="tx_indexedsearch[sword]" />
    <input type="hidden" value="0" name="tx_indexedsearch[_sections]">
    <input type="hidden" value="0" name="tx_indexedsearch[pointer]">
    <input type="hidden" value="0" name="tx_indexedsearch[ext]">
    <input type="hidden" value="_" name="tx_indexedsearch[_freeIndexUid]">
  </form>

The 4.6.18 version which has the same problem can be seen here: http://www.llgc.org.uk/index.php?id=6455

I've tried disabling and re-enabling the extension, flushing the cache etc but nothing works so far, Any ideas on why this just doesn't work and any tips on fixing? 

Thanks in advance for any help.
Sara