The demitting proctors usually report on plagiarism cases they have dealt with, and in the past, they have mentioned the use of ‘screening software’ to investigate cases of possible plagiarism.
You might like to read Melissa Highton’s blog posting: “A pope, two proctors, and an assessor” about the recent demitting Proctors’ address, which reports on cases of “Academic misconduct (including plagiarism)”. Here is the link to the full Oration by the demitting Proctors and Assessor.