Norm is right is a kind of brief concise way. If she left a will, you will have to obtain probate so that her wishes can be carried out by the will's executors (if the will is valid). There will have to be deed drawn up vesting the property in your name and registering you as the owner. These things are necessary to give you the valid title to it and enable you to exercise all the rights of an owner. See a solicitor.
You don't need a solictor. You can DIY once you have probate. Phone your local District Land Registry Office who will guide you through the process. It involves a couple of simple forms and a fee around �60.