In the November 1978 edition of Pet Sounds, the editor of Time Barrier Express wrote that just as the issue was about to go to print, problems including a fire, and change of premises and ownership, had delayed publication of "lost" issue # 24 until the middle of November 1978. Readers were advised to make contact if they hadn't received their order by December of the same year. I guess that they received quite a few enquiries as it wasn't issued until a few months later.
Bumping as I found this Ebay listing showing the issue of TBE immediately preceding the BBs cover issue was actually from July- Aug.1977 featuring a Frankie Valli /4 seasons pic.
http://www.ebay.com/itm/TIME-BARRIER-EXPRESS-Doo-Wop-Rockabilly-Oldies-Fanzine-Magazine-Lot-of-12-/231362657979