Companies House Form DS01
CO.VSO.06
Companies House Form DS01 is the form that should be used to notify the Registrar that the company named has applied to the Registrar to be struck off the Register and dissolved.
This document is in PDF format and the up to date version of it can be found on the Companies House website by clicking on this link to the relevant page: https://www.gov.uk/government/publications/strike-off-a-company-from-the-register-ds01.