Hi Ian - see our PG 5 for guidance on how to make such an application
Adverse possession of (1) unregistered land and (2) registered land where a right to be registered was acquired before 13 October 2003 (PG5) - GOV.UK
This includes guidance on the form to use and how to submit any supporting evidence
All land is owned but not all land is registered hence it being unregistered. Complete the form FR1 with regards the application you are submitting and if that means leaving any blank or crossing them through then please do so
Evidence of identity is not required for such an application -
Evidence of identity (PG67) - GOV.UK
Such claims are very complex ones in law and I would strongly recommend that you seek legal advice. Ensuring that you have satisfied the legal requirements re such a claim comes first and before trying to satisfy the registration ones as outlined in the PG 5