The 8 pin socket has historicaly been fitted to Hornby locomotives manufactured prior to 2022.
Hornby R7335 HM7000-8: Bluetooth & DCC Decoder (8-pin)
R7335 Hornby HM7000-8 Bluetooth® & DCC 8-Pin Decoder
Hornby R7335 HM7000-8 Bluetooth & 8 Pin DCC Decoder
Hornby R7335 HM7000-8 Bluetooth & DCC Decoder 8-pin OO Gauge
R7335 Hornby HM7000-8: Bluetooth & DCC Decoder (8-pin)
