Thank you all for your responses. I thought I would give a quick update to help others who may find themselves in the same situation as me.
A friend lent me his ICE bike repair kit which had all the tools I needed. I also noticed on the link it stated my BB was an octalink however this did not look right. Anyhow I fitted the Tiagra 4600 BB and it worked perfectly!!. The only thing I did was kept the plastic o ring and refitted on the left side.
Last edited by gaggarwal1981; 08-19-14 at 01:56 PM.