Lack of Transparency on One Type of UK Heritage Crime Convictions?

In the BBC article 'How a treasure hunt led to a £3m 'heritage stealing' 21st Nov 2019, British Museum Treasure Registrar, Ian Richardson is quoted .

"I've been doing this job since 2007 and the number of cases of people being convicted for theft, which essentially derives from them not reporting their finds of treasure, has increased.

In another article about the Leominster haul (Harriet Brewis, 'Viking treasure thieves who stole hoard worth £12m with metal detectors are jailed', Evening Standard 22 Nov 2019)  we are told:

collector Wicks[...] had previous convictions for "night-hawking" - searching with a metal detector without the landowner's permission - going back to 2014 [...]

Where can we read about these cases?  Why is the PAS not trumpeting each one as it happens to raise public awareness of heritage crime by artefact hunters? Could it be that if there are "increasing numbers" as Richardson claims, that rather undermines the credibility of the old trope that a "minority" of detector users is doing anything that we should be worried about? Could it be that it also undermines the credibility of the idea that by "partnering" artefact hunters, they will somehow mutate into ersatz archaeologists?