Tags are keywords. I put tags on every post to help you find the content you want. Tags may be people (Dominic Raab, say), organisations (The Howard League, PRT), themes (women offenders, homelessness) or specific items (heroin, racial disparity, ROTL). If you’re looking to research a particular issue, they can be invaluable.
The interesting thing about PbR schemes is that they are supposed to be all about finding creative solutions to entrenched social problems which actually work.