http://www.legislation.gov.uk/id/ukpga/Vict/25-26/53/enacted

PART IAs to the Registration of Real Estates, and the Title thereto

When an indefeasible Title shall arise

23Power to Registrar to refuse Registration.

If at any Time before Registration the Registrar is of opinion that any further or other Evidence is necessary, he may refuse to complete the Registration until such further or other Evidence shall have been produced.