Hi toby,
Are you familiar with FreeBMD?
Here is a link which will help you find your marriage:
http://www.freebmd.rootsweb.com/cgi/search.plJust fill out the appropriate details and hit the FIND button. If you enter both Frank and Ethel's names, only one marriage appears.
Using the reference details you can buy a copy of the marriage certificate online from here:
http://www.gro.gov.uk/gro/content/Or you can follow the links from the FreeBMD page.
This will give you both father's names and occupations.
You can then look at the census (or request a lookup) for Ethel and Frank who you may find with their respective families in the 1881 and 1891 censuses.
Good luck.