Problem found and fixed now, thanks.
If the test were solely about ensuring roadworthiness, I'd be fine with that. However, I can also see why the Eurocrats wanted to introduce legislation to prevent poor quality, untested aftermarket components from dodgy suppliers winding up on the road. Tunisian tyres and brake pads from Pakistan, you get my drift?
I'm not without sympathy for the test centre guys who could get screwed if they try to interpret the laws in a common sense way. For them, safer to say 'no' and put the responsibility back on the owner. Still a right PITA, though.