The last coded boats, i have sold, it was a matter of transferring the names, then a full survey had to be done by the 'new' owner, so i would base it on that you would have to have a full survey done.. sometimes not a complete one, but they will certainly go over all the safety gear, and check it is all there.
Since the yellow rib down south decided to fall apart with 14 people on board, all has been made even tighter by the authorities, and all seams etc should be checked over out of the water.
I sold a coded 7m and the new owner thought it was simply a matter of paperwork, but turned out to be allot more than that. But also once the ydsa, or whoever, are informed the boat is sold - the boats individual licence is put on 'hold' till it is in the right name, so in reallife the boat will not actually be coded for the new owner.and you would not be able to take out passengers till that time.
Angel of doom