You need to speak to your former IP and ask them to remove the restriction. If you have no luck there you can always send a copy of your completion letter to the Land Registry and ask them to remove it.
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk