The first, E.F. Lavender, is the name of the registrar in 1961 whose name appears on the referenced record in book 44B on page 5733. The second, E.H. Miller, is the registrar in 1964 at the time the certificate attesting to the content of the record was prepared. Joshua Simon Oduya is Mr. Miller's assistant who prepared and signed the document.
It sounds like you have done some good research on this document. I suppose that just leaves the coincidence with the numbers.
Thanks for the confirmation --