My understanding is that the issue with gay donors is not the technology, but the politics: the NBS really does NOT want all the "OMG gays will give AIDS to accident victims" headlines that you can be sure the red-tops will come up with. Eventually this will change, but only with a lot of government money for advertising and lobbying the papers. And I can't see the Tories stumping up.
As for the "received blood donation since 1980" thing, my understanding was that this was now dropped? As of a few months ago. The donor form no longer asks the question. I understand that this was a NVCJD question, but now they are certain the CJD isn't a problem, and that everyone who was going to get it now has. People who have been prevented in the past from donating for this reason might want to check.
M