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 association of many PbR schemes with very robust cost-cutting and/or the privatisation of previously public markets has caused considerable controversy and confusion which has enabled researchers working from the same data to reach opposing conclusions about the same initiative.