Thanks ever so much Lynne!!!
I didn't follow it exactly as you put though. Rather than creating $template_hook[postbit_junk] I simply used the existing $template_hook[postbit_userinfo_right_after_posts] and ran the following at "postbit_display_complete" as you said:-
Code:
eval('$template_hook[postbit_userinfo_right_after_posts] .= " ' . fetch_template('postbit_extras') . '";');
And it worked a charm! No more manual updates of the postbit templates for me!