The Japanese 12" version is mentioned in the official discog...

The KLF with Extreme Noise Terror: 3 a.m. Eternal
  [1992] limited single

  7"WL: 1992 UK (KLF Communications; KLF 5TOTP) [1-sided; x1000 mailorder only]
  7"WL: 1992 UK (KLF Communications; KLF 5TOTP) [test pressing]
  7"WL: 1992 UK (KLF Communications; KLF 5TOTP) [clear vinyl]
  7"WL: 1992 UK (KLF Communications; KLF 5TOTP) [mustard vinyl]
    7": 1993 UK (Discipline; 3AM1) [2xA]
   12": 199? JP (Discipline; DISC2T) [bootleg]
   2:43 3 a.m. Eternal


Tim Tim <gunsofmu@yahoo.co.uk> wrote:

.
On further investigation, I now think this is probably not a bootleg. It was pressed up
on 'vinyl japan'. The cat no. disc 2T is interesting as it follows on from disc1T & disc1X
which were both Extreme Noise Terror releases. Did b&j allow them to do this as part
payment?