Noted. I will check my exhaust extensively when I get a chance, but in Aus we haven't had many cases of exhaust rot like you UK guys (in fact I've never heard of anyone here having it), perhaps due to the drier weather. That said, maybe it is on it's way out and a new exhaust is on the cards.i bet all standard 182 exhausts will be full of holes and rotten by now. best to just replace the whole system from the cat back. the one you liked the look of in the pic is a miltek. the rim on them is still quite thick tho.
you could just cut the tailpipes off and weld new ones on, yes, but not much point at all in my opinion.