Number of PIs
"Historically, many private investigators were ex-forces or former policemen, but this is changing. The total number of people working in the sector is unclear."
By "the sector" do you mean the IT investigators or are you talking about private investigation as a whole? If the latter, the question is, does the UK not license them? I can tell you exactly how many there are in Tejas. And name names.
After all, isn't Media Sentry being sued in Tejas because they aren't licensed to operate here?