By law you are now required to register your land with the Land Registry on most property transactions, gifts and sale. If you have not been involved in one of these transactions it is unlikely your land is registered. By registering your land, the Land Registry holds all your property details electronically, which makes Title Deeds obsolete.
Sam Catling from Rostons says that the advantages include making it harder for a squatter to be successful with an adverse possession claim and ease of conveyancing when selling/transferring ownership which can save expensive professional fees in trying to resolve these issues after they have arose.
The Land Registry are offering a discount on registration fees if land is registered voluntarily, which you might as well take advantage of as if in the future if you plan to sell or gift it you will have to do it anyway and pay the full registration fee.