On 4th September, HMRC published updated guidance on policy, powers and safeguards related to how HMRC organises its criminal investigation work, including details of its investigation policy, powers and safeguards. The Criminal Investigation Policy includes a statement on the use of open source material, saying that HMRC may observe, monitor, record and retain internet data which is available to anyone, including news reports, Internet sites, companies House and Land Registry records, and blogs and social networking sites where no privacy settings have been applied
https://www.gov.uk/government/publications/criminal-investigation