BMW M5 Review: 00:57 - 01:32 - That's "back 2 business" by Pop Will Eat Itself
27:37 - 28:07 Kronos Quartet & Mogwai - Together We Will Live Forever (film the fountain)
28:08 - 29:09 Clint Mansell - Lux Aeterna (film requiem for a dream)
I haven't listened to those yet but if correct then both are by Clint Mansell who is a former member of Pop Will Eat Itself.
I came across this forum as I run pweination.com and lots of people were tweeting the heavy PWEI /Ex PWEI songs in this episode.
Lux Aeterna is played on lots of stuff all the time -cricket, x-factor, cooking, any tense bit in a reality show! Actually if you get the soundtracks for Moon, requiem for dream and the Fountain then you hear them all over the TV!