If you had solicitors, they may be able to provide a copy. Be aware that there may be an admin charge if they have to get your file out of storage.
You can get a duplicate from the court - it hels if you have your case number and an idea of the date when the order was made. If you have that, and it was recent, they will charge you but it will probably be only £5 or so. If you have less information or the order was made years ago so the file is no longer physically at the court where the order was made, you can get copies but it will be more expensive.