The 4-pin decoder, previously only available as a spare (X9659), is compatible with the 0-4-0 W4 Peckett from the 2020 range. before placing an order.
6 x Hornby R8249 Digital 4 Function Locomotive Decoder 8 Pin DCC BNIB
Hornby R8249 Digital 4-Function Locomotive Decoder Unopened
HORNBY DIGITAL DECODER R7274 R9659 4-PIN DIGITAL USE MOTOR CONTROL ONLY TESTED
Hornby R7274 4 Pin Decoder Digital DCC Model Railways Accessory