Rust in firewall

tom, May 28, 11:39am
So i purchased a 1988 Toyota Corolla liftback about 6 months ago with a new WoF from AA testing station and it was owned for about 23 years by a couple who cared so much for it! So after getting it home, i noticed that there was a tiny hole about the size of a 10c piece (a bit smaller) of rust in the firewall, but its under a piece of metal thingy so its slighty hidden. There was no warnings about it on the last wof sheet as the car has full service history and everything so is it not considered needed for repair in a WoF? So my wof is due next week, and i need ideas, take it back to the same AA its gone to the majority of its life? or try a garage or something. Cheers guys