A couple of years ago I had a request for redress because two young sailors were picked up by a rescue-boat. I wrote a piece (in dutch) on it, for our regional sailing association, because the boat received redress and the volunteers on the rescue boat felt they were being second-guessed.
(Hulp RvW 41 v3.doc)
The piece was based on a Guidance published by the RYA, because rule 41 had changed in the rule-book. Rule 41 since 2005 permits help to a boat by rescue, without having to retire from the race as long as there's no progress in the race. I've put up the complete Guidance here and in the FILES list.