Quite a coincidence - we both have Charles George Willmore living in London marrying in Westminster. Sadly they are different people. Although I do not have many details I can confirm that your Charles George and Emily maried in 1879. This was in the March quarter.
I also have their details from the 1881 census if you need that.
I'm not sure if it's relevant but on the FamilySearch site there is a submitter from Kent who has a George Willmore in her pedigree file born abt 1821. You may wish to look this up.
When I next go to the Family Records Centre to look up Charles George's birth I'll pass on details to you if you're interested.