I appear to have really messed up.
I tried the suggestion on http://bavotasan.com/tutorials/wordpress-3-1-the-new-admin-bar/ which did not work for me. I therefore, went back to delete the code I had entered in order to start again and now all I have is a complete, blank white page. I'm guessing there is nothing I can do accept have the site competely deleted and rebuild from scratch. I am a not overly technical but have dabbled long enough to think I could get back to where I started from without loosing everything.
http://www.compressiontights.org.uk/wp-admin/index.php should take me to WP sign in or as I was already signed in to the dashboard. With only a blank page I'm stumped. Any help will be much appreciated.