Just a word of warning on this - this is another of those fabulous releases from EIV (which DJ Krime had good fun with for the last few weeks) where the UK basically get an inferior transfer to the rest of the world. In this case, the main complaint being the soundtrack, which for the UK is only Dolby Digital whereas the US get PCM lossless and Dolby TrueHD soundtracks. I'm also led to believe the video transfer isn't as good (though haven't been able to confirm if it's 1080i like The Reader, or 1080p but definitely uses a codec which isn't as good as the one used on the US disc).
At any rate, £17.99 is very cheap for all three films on Blu-Ray, but the US and Australian versions of the films offer a better transfer it seems so up to you whether you want to pay more for this.