Penny and bun.

As anyone who has ever been involved in organising one will know, the very essence of a civil wedding before a Registrar is that it must be devoid of any religious connotations - you can't have any reading or music with the slightest religious connection - Elizabeth Barrett Browning's well-known and very apposite poem "How do I love thee" can't be used, for example, because - although the subject matter is not religious - it includes the word God. So given that they are performing a ceremony from which religion has been quite deliberately excluded, why should some Registrars quote their Christian faith as reason why they should not be called upon to perform same-sex partnership ceremonies. You can't have it both ways, folks!