Where to get B S tools?

Unfortunately OS engines are built on the British Units system. So the shafts have diametre to this "standard".

Is there anybody who knows where to get drills and eventualy taps, nuts, etc.  at those dimensions?

Thanks,


P.S. I still wonder how the new american republic may have kept this archaic system when they separated from Britain. Afterwards, of course, that what quite an other problem.

I bought some from ebay. 

There's a lot of different price.
I order one for a good price from an english shop on ebay

I needed one for my handy third hand project.

I found that table somewhere on the net.