[Daniel Ramsey]

Sounds like the time i owned an old British made car, neither metric or SAE wrenches would fit. Wound up filing down some bolt heads eventually.

[Hillarys Gate Cult]

Do you mean these?

http://www.samstagsales.com/whitworth.htm

[Eric in the Ozarks]

That was BS...British Standard measurement.

Usually BS bolts were located under the intake manifold or someplace equally inaccessible...