Thank you - I will have to check with the local registrar then and find out if they will allow it. It sounds like its up to the local council whether they offer it or not.
I have an image of a candle lit room, a fairly informal ceremony with all the guests gathered around rather than formally seated and lashings of bubbles! Canapés and a nice buffet. That way we get to have everyone at both the ceremony and party without all the formalities!