I was typing while JD was posting.
There are several postal addresses (with various postcodes) associated with that sort code, representing the different branches within the local group. As stated, I believe that the 'Branch Manager' (who actually looks after several branches in the area) is most likely to be based in the High Street, Nottingham branch. However, mail addressed to any of the branches should still reach him, so JD's answer is just as valid as mine.
Chris