How should formal invitations be set out?

Question

is it still "fred bloggs and Mrs fred bloggs" or is the wife's christian name used these days?

Answer 1

use christian names

Answer 2

Mr. & Mrs. Fred Bloggs is the traditional formal usage; but nowadays it would probably be fine to address the invitation to Fred and [wife's first name] Bloggs.

The traditional formal usage makes it look like Mrs. Bloggs is owned by her husband.  What a ghastly concept.  Besides that, Fred is not her name.

Answer 3

formal should still be

     Mr&Mrs Fredrick Bloggs request the pleasure of

           "your Name"

               and then the reason for the invite

     be it wedding   christening  candlelight supper ect ect  

Answer 4

It is still 'Mr and Mrs Fred Bloggs request the pleasure of your company ...etc'