Hi.. I'm an MOT tester. It is quite normal to have some up/down movement in the shock. 10mm does seem a lot though.. Have you changed the upper bush too ?? Its likely just the damper rod..The tester should be able to differentiate between linkage, swingarm and shock movement..
Sadly, some testers aren't even bike mechanics or are just needlessly difficult.
Even brand new bikes (eg tiger 800) has a lot of freeplay in their fork bushes from standard and a BMW rear wheel drive can safely have free play.
The point is, an MOT is 90% opinion of the tester. Find a good one with common sense.
Take it elsewhere and ask them to quickly check it before test.
I work near Chester.( are you close ?) I'll give you a ticket assuming the rest of the bike is okay..
Ted
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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