the threads on the caliper are fine, not strectched, so i dunno if the bolts threads could have been, im no expert, guess it could be possible, but they were treated to a (small) dab of locktite.. just glad it didnt cause no more damage, and very lucky the disc didnt warp either.
the rad, yeah plain bonkers really, although it was topped up before the massive freeze we had, still not a good thing to do granted, should have swapped out the rad for the new one sooner..