So many couples get married in the Registry Office, but you should really think about using a celebrant! With a good celebrant the choice is so much broarder. You can get married in a great location, have as many guests as you wish (limited to 12 at the Registry Office) and celebrate with a glass of champagne after the ceremony - no alcohol permitted at the Registry Office.
You may want a very simple ceremony with only two witnesses or perhaps you want 20 or 80......the choice is yours.
A good celebrant will tailor a ceremony to suit you and take the time to learn a little about you as a couple......if you wish. Alternately you can say to your celebrant that you simply want to say the legal words required and that is what you should get.