Smudge,
the Smiths autopilot on the 'K' was one of the many UK supplied items of kit. From whence it came I know not but for a good time in the early days of the 'K' it was not cleared for use ! Hence on the longer routes we all took turns at 'poling' the beast. I recall being shown ADF sets with BOAC Speedbird stickers so that kit at least was secondhand. The i/c system was UK sourced also. I am sure that the learned posters on this thread can supply more details.