The techniques they used on some of their material (especially on Dummy) were quite odd (aka brilliant

). They would record each of the tracks and then have them mastered to records. The records were then mixed backed together off of turntables into a multitrack reality. This was not only for drums but, also vocals etc. I am not sure of the method for recording the initial tracks but...
One way of accomplishing a simlar feel to the sound is to record your sounds to analog multitrack recorder using multiple tracks for the same signal the tweaking each of the individual tracks and "ping-pong" them to other tracks. And then do it again and again tweaking each of the tracks until you get one drum track to dump into a sampler DAW etc that fits the mood you are looking for...
I read an interview with Geoff where he outlined some of his approach to recording Dummy and it was one of the single most ispirational interviews i ever read.
At the time my "studio" consisted of a yamaha tx16w sampler (using a casio cz-1000 if memory is correct as controller) and an analog 8-track recording console (yamaha mt8x). I borrowed my brothers Boss dr-5 druim machine for basic sounds and pattern programming and would spend hours recording to tape and then sampling from tape only to record back to tape. It was amazing what replaying an analog cassete over and over would do to the sound of even basic drum sounds.
Another trick from the same interview is to take your drum track and reverse it. Then apply reverb and other effects to the reversed audio and the flip it back around.
I love the grittiness of the '90s Bristol trip-hop sound and have never been able to accomplish anything close without at least some analog recording in the process. But, that is just me i am sure others have differet experiences.