I would also doubt WhoIS access ranks large on Plod evidence gathering lists
But it used to feature ... after all it was complaints from Plod that .co.cc Whois details were "inaccurate" (= largely fictitious) that got Google to voluntarily delist .co.cc from their search results with the intended effect that .co.cc should cease registrations. It duly collapsed.
Very chipper from that success, Plod then announced that they were going after sub domains, and wanted full and truthful info in Whois for that as well. That seems to have stalled a bit!
All domain registrars now have a paragraph in their Ts&Cs saying that to feed them porkies for the Whois info is a service terminating breach. I wonder why, if Plod isn't using the info.