I am a soon to be HOD in a new school. At interview I went up against the second in department but I was given the job. The soon to be new colleague seemed quite friendly and conciliatory throughout the day but I obviously haven't seen them since the offer phone call. And how much can you really know from an interview day. The colleague seems to be at a similar career stage to myself. Any tips, however simple on managing this potentially awkward relationship will be very much appreciated!