You may not have seen a British Leyland V8 car, but there were plenty. Some Rover, Triumph and MG models had V8s, all under BL ownership.
The Triumph photo above is a TR4 with optional hardtop featuring a removable "Targa" or "Surrey" roof panel. Stags had a soft targa roof with built-in roll bar, quad headlights, more curves than a flat-sided TR4 and a Spitfire-looking rear, along with a Triumph designed and built V8.
Some Rover models and the MG MGB GT V8 used a B-L'ized Buick 215 CI aluminum V8. TR8's, used the a variant of the Buick-based V8.
Got any more pics, Sam. Love 'em!