Occasionally referred to as "5d" despite there being little basis for this assumption other than the length of the track being similar to that of a known track length of an unreleased song.
The video below for "5d" is a part of the official BoC playlist selected by BoC which does give credence to track "R35TT A06" being "5d".[1]
The initial sample in this track, lasting the duration of the piece, is a pitch/speed-altered version of the base sample for the track "Seven Forty Seven" released as part of the Warp20 (Unheared) compilation.
It also plays a very light sample, around 3 minutes 20 seconds in, of a woman with a southern American accent apparently pulling up to a drive-through fast food ordering microphone and asking "Yes, what comes with, uh, chicken fingers?" This same sample is played in the background of "Dave (I'm A Real Traditionalist)".
At 04:04, a heavily manipulated voice can be heard saying "too good to be true". This was discovered by Twoism user personman to be sampled from The Dave Clark Five's 1967 song "Everybody Knows"[2]