Shortly after the market introduction of the SD1, the engineers already planned an estate variant, as the successor of the Triumph 2000/2500 Estate, the SD1 Estate should get an attractive addition.

Two Prototypes were built, which was used by the BL Chairman Sir Michael Edwards and allegedly even from Prince Charles.

Basic was the normal 3500 V8 with auto gearbox, but guess what happened – nothing, this variant never went into production, lacking of money an courage.