From 13th October 2025, you will need to use the GOV.UK One Login to sign in to your Companies House WebFiling account.
This is part of the move to a single sign-in which should make it easier and more secure to access government services.
You can find out more, and the steps you need top take, with the gov.uk link https://www.gov.uk/government/news/access-to-companies-house-webfiling-accounts-to-move-to-govuk-one-login.