I see their marriage record on www.freebmd.org.uk
but this is only an index. Here's the info:
Bromley District, Kent, England
Marriages in June 1858
Volume 2a, pg 327
George Winggate (sic) to Mary Ann McCarthy
With the volume and page number, I'd order a copy of the actual certificate to see if it gives the names of her parents or her birthplace. Here's how to order one...http://www.freebmd.org.uk/Certificates.html
Alternately, the familysearch.org website shows a series of Bromley marriage records for this period. I could not view it, however. It seems that there are licensing considerations, so that only users with an LDS account or those actually sitting at an LDS library can view it. It may just be a duplicate of the civil registration document but I'm not really sure, so it may be worthwhile to get someone to look it up for you as well. For what it's worth, then, here is the link...https://familysearch.org/pal:/MM9.3.1/TH-1951-23190-40470-21...
Hope this helps, good luck with your search.