I can make up some "BS" stamp... (One for the US guys there!)
On a more serious note though, take a look at this page: The Motor Cycle Silencer and Exhaust Systems Regulations 1995
Although it's official babble, it (appears to me) clearly say that the can(s) and/or system should be clearly stamped "BS AU 193" or "NOT FOR HIGHWAY USE" or "PRE 1985 M/C ONLY", unless it is stamped with an "equivallent" certification from EEA member state; which doesn't include Japan or the USA as far as I'm aware!
Where's Lukeyhookey when you need him?!
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Andy.
NSR-WORLD.COM
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