Hi Simon,
Here's what I found in the file for your bass:
89MK5519 MKLB4 Mark King Delkuxe Bass
top and back: Coco Bolo
accent: Maple laminates
core: Mahogany
neck: Maple and Purpleheart, 34 long scale
fingerboard: Ebony with pearloid ovals
pickups: AXY
controls: volume, pan, filter x2, 2-position Q switch x2
output: mono, face mounted
originally made for: Bass Centre, London
birthday: August 30, 1989
One previous registered owner in England, one history request from another individual, but it is unclear if they owned the bass at the time.
I think Tony Bacon and Barry from the Bass Centre are friends, so I wouldn't be surprised to find that Alembics that findtheir way into Tony's work are sourced from the Bass Centre.