Yes, it's 1mm.
The only requirement on pairing is the construction. You get onto dodgy ground if you mix radials, belted bias, X-ply etc. in the wrong places. Two tyres from the same range give the tester a warmer feeling.
The usual hassle isn't the tyre inspection it's inspectors that can't work their roller brake testers. Knobblies as a whole don't get on with roller testers as the low contact area doesn't get chance to flatten out on what amounts to a slick metal surface. The lock up is so quick the tester reads "no test", which some MOT techs take as a fail. Other testers take the bike outside, do a couple of stoppies and print off your next 12 months ticket!
Best way to get an MOT is to just present it and see what mood your testers in. I'd leave it alone and go for it.
Andy
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