Do to an excessive amount of Spam the PISD mail server went down a few days back. I have installed a new, more robust email server so the issue should now be fixed.
Your email might have gone astray due to the changes. You can request a resend by filling in the "Help I have forgotten my login details..." section here:
https://www.pisd.co.uk/sgo/webstore/login-failure?
If you are still having trouble, send an email to
someone@pisd.co.uk with a reminder of your problem and I will look into your specific account in case there is a more complex issue at play.