I saw the ad in The Metro who clearly felt it was fine to print, however a spokesman for the FT said:
"Editorially the FT was more than willing to run the advertisement for Amnesty. Unfortunately, whilst Amnesty gave us written assurances that they would take full responsibility for the comments and opinions stated in the advertisement, it became apparent that Amnesty's lawyers had not had a proper opportunity to advise Amnesty on those opinions. As a result, from a legal perspective we were unable to rely on Amnesty's assurances."
Check out http://www.protectthehuman.com/demanddignity for more info.