avery123 - 6:21 pm on Nov 23, 2011 (gmt 0)
Errr... ehem... Problem solved.
I have now deactivated the plugin called "Table of Contents Plus"
It Automatically creates this anchor text linking box (a bit like the top of a wikipedia page) for use on Long Pages. I must have triggered it when my page became longer.
I must have downloaded this plugin a while ago, thinking it was to do with Styling specific text, like tables of information etc.