If anyone out there really wants to know the English law on the prevention of crime, it has just occurred to me to point you to the Crown Prosecution Service website. I think what is said there accurately represents the law.
[Archbold is a book + mailing that updates professionals on the law, especially precedent decisions of the superior courts.]
Phrases such as TLR refer to the place where law reports can be found (here, Times law reports - the newspaper. In England, a law report made by a barrister, as the Times reports are, may be used in a hearing).