Companies House has announced that their online services will be moving to GOV.UK One Login from this Autumn.
GOV.UK One Login is a new way to securely access government digital services with just one account, username and password. It also means that we should not have to enter information multiple times.
You can read more about it at https://www.gov.uk/government/news/companies-house-to-join-govuk-one-login.