"The Crown take the view that the following factors taken together are decisive in concluding that the convictions must be regarded as unsafe. a. The very serious nature of the subsequent criminal conduct of Spackman. It is substantially more serious than that dealt with in previous authorities and displays an ability to conduct complicated deceptions within a police environment. b. That the 'informant' in this case [Fletcher] was party to the criminal conduct with Spackman. c. The time lapse between the convictions and the established misbehaviour is short in the time frame established by authorities and both events are connected. d. It is impossible to absolutely to rule out, by reference to other evidence, the suggestion that Spackman behaved dishonestly, in every aspect of the investigation leading to these convictions. e. It is impossible to assert, with the degree of confidence necessary, that the judge was not misled in any respect in the considerations of PII material."