Change marriage law in England/Wales from registered buildings to celebrants.

Currently in England and Wales couples must choose either a religious service in a church, or a wholly secular service in secular building, where they are not allowed anything even vaguely religious including music. Under the Scots system couples can choose any venue in which a celebrant is willing to conduct a marriage service, and a religious or civil ceremony. This means that couples can choose a religious ceremony in a greater choice of venues, and administration is simpler (and probably cheaper).