https://www.gov.uk/guidance/apply-for-a-partial-exemption-special-method?utm_medium=email&utm_campaign=govuk-notifications&utm_source=ad7602dc-c46c-4572-9278-294a79b33974&utm_content=daily
Use this service to apply for a Partial Exemption Special Method to recover input tax on goods or services you supply.
partial exemptionspecial methodgov ukapply