#MrBatesVsThePostOffice
The Youth Justice & Criminal Evidence Act 1999 repealed s69Police & Criminal Evidence Act 1984 which broadly stated computer evidence may only be used if it can be shown the computer was properly operating & not improperly used

legislation.gov.uk/ukpga/1984/60/…
This meant that a common law presumption came into play :
"In the absence of evidence to the contrary, the courts will presume that mechanical instruments were in order at the material time"
#MrBatesVsThePostOffice clearly proves that presumption wrong