No, it's not in a grey area. It's specifically *named* as being banned under the Psychoactive Substances Act 2016 by the Home Office. So stealth is important, and your post being far too specific about it makes it, by definition, not stealthy. From https://www.gov.uk/government/publications/forensic-early-warning-system-fews-annual-report/annual-report-on-the-home-office-forensic-early-warning-system-fews-2021-to-2022 [at section 2.4.3] - section also uploaded to https://imgur.com/a/Mt9AhYy