According to Colin Sutton, writing in the Wakefield RISC OS Computer Club's newsletter, "the machines were supplied by Uniqueway, with Paul Middleton [now of RISCOS Ltd] lurking under the desk operating the computers." Further details can be found in April and May 2000 issues of Archive magazine, where Paul explains the technicalities of using RISC OS computers in film production.
Rancid Aluminum (cert. 18) is on C4 at 2.25am Sunday night/Monday morning. More rare appearances of our favourite computers are listed in TIB's Media Watch section.