Firstly, well done on completing. Secondly, once you have your completion letter then you will be able to sell your house as the restriction placed by your IP company at the Land Registry will be lifted.
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