Bit of a strange thread title I know, but....
The middle part of my exhaust had a couple of holes in it (noticed at last service but told it was nothing to worry about for the moment). It got slightly worse and my Dad has patched it up by putting part of a tin can round it (we tried the bandages etc you get from Halfords but it blew straight through them).
As far as I can see there is no leaking from the hole anymore and no excessive noise (infact it sounds like a normal exhaust again!)...
It has to go for its MOT in a few weeks, is it likely to pass? Or fail because it's been patched up etc?