The original BL keys are VERY hard to find in uncut form. Like Neil ha shown you might find a complete lock assembly with keys, or blanks in the same style but without the BL swirl on the molded head.
If you find a source let us know!
Tony

<font size="1">1981 TR7 FHC Cavalry Blue
1980 TR7V8 DHC Jaguar Regency Red - sadly sold!
1977 TR8 FHC EFI Factory development car Inca Yellow</font id="size1">