For resetting your Email account you have a couple of options to do so:

  1. Through your webmail account when logged in at mail.uk2.net

  2. Through your CHI account when logged in at chi.uk2.net

For changing your email password through the UK2 webmail interface you will want to select the settings option as seen here:

Reset Webmail password 
Within the settings menu located on the left-hand side you will see a password option.