Your children would get equal shares in your estate:
http://www.hmcourts-s...rvivedTheDeceased.pdf
However you should still write a will, if for no other reason than to simplify things for those you leave behind. There are some important issues to be dealt with. For example, do want your house to be sold with the proceeds placed into separate trusts for your two children, or do you want to keep your children in the house (with, perhaps, a relative having the right to live there while she cares for them until they're both adults)? If funds are to be placed into trusts, who are the trustees to be? There are lots more questions like those which need to be considered.
Chris
(Former MD of a a will-drafting company)