Finally got an ILS Issue!
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I finally encountered (possibly) the "ILS bug" that I've heard many complaints about. I was flying into EGLC, ILS rwy 9 LCY (D108E) NDB transition flying the turn with GPSS on NAV mode, near the end of the turn, I manually switched the CDI source to NAV (VLOC) with the TDS 750 which initially captured the LOC right away. With glide slope alive, I selected APPR mode: this annunciated HDG and APPR/GS. Despite APPR/GS annunciations, the FD/AP refused to capture/track LOC and instead remained on HDG hold despite the CDI being centered on the localizer. Switching back to NAV mode, it would happily capture and track the LOC on NAV mode. Since this was a 5 nmi final, I hand flew the APPR using the HSI with the FD off. I am curious if I mishandled anything with the Century IV in this example. I tested the APPR again once intercepting with HDG mode, and again with the same method I described above, but was not able to reproduce the issue... It seemed to have fixed itself once reloading the flight.