I am in the process of a divorce which is taking a long time as X is crap with paperwork. I have sent my marriage certificate off via the lawyer but am probably months off getting the decree nisi/absolute. In the meantime, I am trying to get established in a new career and want to use my original name as X was also in the field and his surname is unusual. I would rather people got to know me as me IYSWIM and not as X's former wife.
I am sure that I have read on here before that there is no formal process for reverting to using your maiden name. Some (happily) married women do use both, one professionally and one personally, I think?