Daimler Double Six - Export specifications

I'm in the market for a late model Daimler Double Six ( series 3 ( 6.0L ), and have seen a couple of re-imports of Japanese cars, ( which have the advantage of being RHD ).

There's a Haynes owners manual that covers the American export model, but I can't seem to find any specification info for the Japanese export model.

Anyone got any ideas?