In the package that you get from the post office, there are guidance forms as well as the application form. It clearly tells you that a name change incurs the full standard fee and that supporting documents must be sent in, along with your current passport. If your new photos and old photos are clearly the same person you do not have to get them certified again. Equally you can choose to leave the passport in your maiden name if you don't want to pay £77.50 but just make sure you book your flights and get your visas in your maiden name too, and carry a copy of your marriage certificate with you in case any of your other documents, cards etc are in your married name.