Dying without a will is dying intestate and statutory rules apply to the distribution of your assets.
If at death you were married or in a civil partnership your spouse/partner inherits the first £250k
If there are any children(incl. adopted /illegitimate) and the assets exceed £250k then the surplus is divided one half to the spouse/civil partner and one half between the children at age 18 or above*. All chattels will belong to the spouse/civil partner.
If no children then the spouse/civil partner inherits all.
If there is no spouse /civil partner then the children will inherit all to be divided equally*
Where there is no spouse/civil partner or children then all assets pass to the parents in equal shares if more than one*.
Failing that it moves on to brothers and sisters*
Without them it passes to grandparents*
Finally it is aunts and uncles*
If there are no relatives at all then the Crown takes it all.
*items means that if those due to inherit have died before you then their children can inherit the share applicable to them
It’s much simpler to make a Will!