Hello All

I recently bought a polo that seemed in quite good nick till I got a wet foot while driving in the rain, and had a look under the battery

and found a big rusty hole

I've cleaned away the rust , and painted with hammerite, and then covered the hole with a plastic lining to keep my feet dry, but does anyone know whether this might cause it to fail its MOT? which is due in February?

Any advice greatly received, thanks