Adjustable bias valve if fitted has to be tested in its worst case setting i.e. full force to rear (a bit of a waste of time then) unless it is locked off so it can't be adjusted without special tools. This is usually taken to be welded or locked with a roll pin - lock nuts are not acceptable as they can be easily unlocked with a spanner.
Some people have gone to the trouble of cutting a roll pin in half so to the tester it looks like the adjuster is locked and theoretically they can't mess with the car and have to test it as presented but that seems pointless to me as the pin could just be drifted out after the test anyway.
In my case the adjuster is hidden away behind a panel which also prevents anyone fidling with it.
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