If I've understood the document, relatives still have to consent regardless of whether the donor has opted in (misdee, does that sound right to you?). So I assume it covers both those who had opted in, and those who hadn't but who are in "suitable condition" to be potential donors.
Useless fact - Spain has more traffic accidents that UK which is one of the factors leading to an increased organ donor rate. But their refusal by relatives rate is under 20%.
Interesting thread. It's been on my mind as Dh has taken ds1 away for the weekend (what if they don't come back - you can tell that I'm in a positive frame of mind!). I'm definitely of the opinion that I would prefer them to be able to be donors (ie someone wins out of the situation), but like sparklymieow, no-one os touching mine or dh's eyes!