When two or more people purchase a property you must to decide whether or not to purchase that property as joint tenants or tenants in common:
Joint tenants possess a right of survivorship, that is, the interest of a deceased joint tenant passes to the surviving joint tenant(s). This means that a joint tenant does not have an interest in the land that can be passed to another through a will unless they become a sole owner because the other joint tenants have predeceased him or her.
Tenants in common do not possess a right of survivorship and on their death their interest passes according to the terms of their will. If a tenant in common dies intestate (without a will) their estate is distributed according to the Wills, Probate and Administration Act 1898. It is not necessary for tenants in common to have a unity of interest, they can therefore hold unequal shares. For this reason the shares of tenants in common must always be shown on the transfer.