OK, this will tidy it up better and make the other pages read correctly. Instead of removing the end part just replace {$powered} UBB.threads™ with whatever you want to appear on your main page:

Quote
From:

<title>{if $inputTitle}{$inputTitle|strip_tags} - {/if}{if $powered}{$powered} UBB.threads™{else}{$config.COMMUNITY_TITLE}{/if}</title>

To:

<title>{if $inputTitle}{$inputTitle|strip_tags} - {/if}{if $powered}London's busiest forum{else}{$config.COMMUNITY_TITLE}{/if}</title>