My car was also originally Ivory White with a black interior.
Just to be clear, Ray's car was originally two-tone Ivory White over Black, with Black trim and top. This color combination was relatively rare, judging by the color table I've been keeping, which currently has original colors for 3,825 BJ8s. Using 3,825 (which is 22% of total production of 17,712 cars and therefore a significant sample and a good approximation to the actual color distribution for the total production) as 100%, the color distribution is:
BRG 905 (23.6%)
Healey Blue 777 (20.3%)
Colorado Red 581 (15.2%)
Metallic Golden Beige 553 (14.5%) - this is a special case, since the total cars painted this color are known. It is 3% of total production.
Ivory White 511 (13.4%)
Black 316 (8.3%)
Healey Blue/Ivory White 60 (1.6%)
Florida Green 51 (1.3%) - another special case, since total Florida Green production is known. It is 0.3% of total BJ8 production.
Colorado Red/Black 36 (0.94%)
Ivory White/Black 18 (0.47%)
Black/Colorado Red 10 (0.26%)
Ivory White/Colorado Red 2 (0.05%)
There were some one-off paint jobs from the factory. Except for the last one listed, all were UK Home market cars.
BRG/Ivory White (HBJ8/34571) - written off in South Africa in 1971 by the second owner.
Jaguar Mist Grey (HBJ8/42743G) - with second owner in Cheshire, England from 1992. Blue leather trim.
Riviera Blue (HBJ8/31277) - Blue leather trim. No record of any owner, BMIHT data only.
Silver Grey (HBJ8/42230G) - Red trim with white piping on seats and equipped with seat belts. Leather not listed in BMIHT data, but I would suspect this car had it. Also listed with a hardtop, not supposed to be available for BJ8s. No owner recorded, but supposedly this car was a special-order for one of the daughters of Leonard Lord.
Black/Ivory White (HBJ8L/30749) - Black trim. German-spec car. No record of any owner.
The figures above are subject to change as more data is acquired on original colors from BMIHT data.