As has been the case with all my posts I shall now answer my own question:
To remove the header 1 tags from the title of the subcategory links using the code on page 14 I have used the strip_tags variable modifier as follows:
Code:
<td class="ColumnTitles" valign="top"><a title="{$subcat.description|strip_tags:false}" href="home.php?cat={ $subcat.categoryid }"><img src="{if $subcat.icon_url}{$subcat.icon_url}{else}{$xcart_web_dir}/default_image.gif{/if}" alt="{$subcat.category|escape}" /><BR />
<font class="ItemsList">{ $subcat.category|escape}:</font></a>
I just love it when code does what you want it to!