I always check DVD-BDR for spanish subtitles because my wife is mexican. I bought the UK issue of Iron Lady on April 30th and it contains only English subtitles. The only solution is to buy the USA issue which contains spanish subtitles, however the BDR is region-locked A (i.e. region A only) so you would need to get your player modified to read it.(I'm assuming you are in Europe) Apart from that, nothing available at DVDGO (Madrid) and here in France the film does not exist either but probably won't have Spanish subtitles when it finally comes out end june. Other solution assuming you have a multi region DVD player : get the USA version in DVD format ( and not BD-R).