I'm a little skeptical on the diagnosis of carby ice for this flight. So they had ice, cleared it, applied power, headed home, did a couple of go-arounds and then ice builds up again on downwind at cruise power?
Sounds a bit strange, although I note that it says that no other fault was found.
Surely this must be a big issue up there in similar weather?
If icing was so likely that day, I'd have thought other aircraft in the circuit may have experienced the same issues.