"There were 23,724 seizures of unknown substances, a 27% increase on the previous year (18,643) . . . Where a drug is described as ‘unknown’ or ‘drug not known’, this generally means that police forces or Border Force have seized substances which they cannot easily identify".

Thanks for flagging this report Harry - really interesting. I wonder if some of the 'unknown drugs' might also be nitazenes - depending on what testing modalities they're using....