I don't think anything has come out with the HH102 catalogue number (and maybe never will). There is no HH101 either.
There is no reason to assume that there is any logical connection between HH100 and HH 103. Maybe there is a significance to 103 that has nothing to do with a numeric sequence.
103 Cullen Drive, Glenrothes was my first house - that's why Julian gave QE Hall that kakalogue number... maybe