We should go the European way.The obligatory legal part of marriage takes place in the Registry office. It cannot happen anywhere else. Anything that happens after that - church or party, or both can take place anywhere, without hotels and the like having to get wedding licences. Once you have done the legal bits, if you want to plight your troth, surrounded by half the population of London on the top of Ben Nevis or the bottom of Loch Ness you are free to do so.
stephenfryer Your GD and partner should marry quietly. not mention it, then in 5 or 10 years time when all those who had expensive weddings are getting divorce they can casuall mention that they married some years ago and no-one will give a toss.
In the meanwhile they should both make wills that cover all the legal issues that come automatically with marriage, so, if their partnership does break up, each partners right to a share of the house, care of the children is protected and, if disaster strikes and one does die, the survivor can make the funeral plans, inherit the home and the assets they may have acquired.