Have you considered a will, or revising an existing will? A will not only looks after the distribution of your assets once you die, it can also be used to appoint a guardian for any children you have who are under 18 years of age.
Do you know the difference between Enduring Powers of Attorney and Enduring Guardianship?
John Alam & Partners Financial Advisers are able to explain these estate planning tools and prepare you to set these up through a solicitor.