The House of Lords may have pondered the proper limits of the criminal law when hearing Attorney General's Reference No. 4 of 2002; Sheldrake v. DPP [2004] UKHL 43, [2004] 3 W.L.R. 976, conjoined appeals which concerned the interpretation of section 5 of the Road Traffic Act 1988 (a blood alcohol offence) and section 11 of the Terrorism Act 2000, but the specific questions they were asked were rather narrower and the answers rather unsatisfactory.