This was our response from our registry office, doesn't look too promising! It really annoys me that the feeling seems to be 'you can have
something but you can't call it a wedding'. Grr.
"Hi Sarah. Thank you for your email. Unfortunately we are unable to use such words for a civil partnership such as wife and marriage but we endeavour to make sure every ceremony is as personal as possible and will try and accommodate any special requests where possible"
We're going to the open day of our booked venue soon where the registrars have a stand so will try and get a better answer from them in person, if wife and marriage aren't allowed maybe bride/wedding would be, but not holding my breath!