I think you will find that the first out of sequence reg was the D.H.Moth G-EDCA which was owned by the DIRECTORATE OF CIVIL AVIATION and flown by Sir Sefton Branckner(?). This was later replaced by another Moth, a DH 60X which used the SAME registration !!! Bet the CAA don't want anybody to remember that one. This was in the time of the quill pen as well circa 1928/30. Does that give anybody some ammo for a discussion or am I just a sad old anorak?