CI Carioca 5 Habitation Door Lock

[Skybluearmy]

The key will no longer operate the lock so I was unable to open the door (got in via the cab). I took the lock off and it appears to operate ok. The problem seems to be the barrel, it won't turn with the key. Getting spares for my 2004 CI is never straightforward (have to come from Italy, so I'm told). Anyone know if its just a case of fitting another barrel, or will I have to get a completely new lock? Any info will be appreciated.