Rees's daughter confirms that he worked for MI6 then and through at least 1949: "...And in the afternoons he went to 54 Broadway, next door to St. James's Park tube station, the offices of SIS (or MI6), where he worked for the Political Section which... assessed and evaluated information..."
Fiica lui Rees a confirmat faptul că el a lucrat pentru MI6 cel puțin prin 1949: „...Și după-amiezile mergea pe 54 Broadway, lângă stația de metrou St. James's Park, la birourile SIS (sau MI6), unde a lucrat pentru departamentul politic care... evalua informații...”