He had returned to Oxford with his wife Edith and infant son, John, in 1918 and worked as a lexicographer engaged in the compilation of the New English Dictionary. He also provided private tutoring to undergraduates and was in the process of compiling a Middle English Glossary for his former tutor Kenneth Sisam.
After moving to Leeds, as the plaque at 2 Darnley Road now testifies,
'.. he collaborated on a new edition of Sir Gawain and the Green Knight ..'.
This collaboration with E.V. Gordon would see Tolkien the tutor, working with one of his former students. Gordon studied at University College, Oxford and an entry in a college account book from 1920 of payments to tutors confirms his tutelage by Tolkien.
Tolkien Society Seminar 2016