Underbody tray - MOT fail or not?

[dangermousecav]

Bit of a grey area this one but want to know before I make progress.

I'm slowly turning my Corsa into a track car and I want build a front to rear undertray. I noticed this done on a members nova in the project/restoration thread but couldnt remember who's car it was.

Basically the plan is to construct a flat surface under the car like the Lotus Elise to help air flow and run up from under the car with a rear diffuser.

The problem lies with how is this percieved by MOT testers. I know they like to poke and prod underneath to see if the chassis is of sound structure but if I fabricated the aforementioned undertray, would this automatically become an MOT failure as the chassis isnt viewable or accessible?

I have stripped and resealed the chassis legs and floor and they are all solid but is my word good enough come MOT time?

Help and advice would be great please

[hay_lewis_68]

its not an MOT fail mate, as we aint allowed to remove anything during a test, and if we cant see it, we cant fail it. its no fifferent to not being sble to see behine a plastic arch liner or side skirts etc.

[Nobbie]

^What he said^
You just might get an advisory of structural parts covered, or similar, but not an MOT fail unless it's insecure, or interfering with anything else.

[dewismotorsport]

It's Lee303's car I think you on about it's under lee's garage in progress thread

Interesting info above, next time I've got a ****ter that needs MOT'ing I'll stick a quick under tray on and some side skirts

[dangermousecav]

Cheers for the help and advice guys. muchos gracious

[Andybon]

Think it will be put down as an advisory.