Sharepoint - Site Collection Administrator has left the building
Ok Paul, you will need help from Share-point admins (someone with server access to the Sharepoint farm). You need someone with SharePoint admin privilege to open Central Administration and update the Primary\Secondary site administrator. I don't have any 2007 running so steps here are from sp2013 but it is very similar.
- Open Central admin
- Open application management.
- Click on Change site collection administrators.
- Choose correct web app and site collection, change the admins and click ok.
I don't have any experience on SP2007 but stsadm may help you I guess. You can set another user as a site collection administrator. This link and this link may help you.