The basic dichotomy is between the Interview (get information) vs the Interrogation (get confession). The former more closely resembles direct witness examination; the latter more resembles cross examination.

Starting with the basics,

Interview Techniques (~30 min.)

1997 Federal Law Enforcement Training Center gov.ntis.ava20440vnb1 VP-023-97 Federal Law Enforcement Training Center - This video depicts an effective law enforcement interview using the five general stages: Introduction, rapport, questioning, summary, and close.
Since the UK author mentions it, let's look at the Reid Technique of interviewing and interrogation (Wiki)

Here's a sampling of Reid's four major points (about an hour total)

Interview & Interrogation Part 1

Interview & Interrogation Part 2

Interview & Interrogation Part 3

Interview & Interrogation Part 4
My opinion is that the Reid methodology (as to verbal cues and body language) includes some witchcraft and alchemy; but that opinion may derive from having been a student of Yale Kamisar, and not of Fred Inbau and John Reid.

Finally ...

Don't Talk to Police (~50 min.)

A law professor explains how talking with police can get you convicted of crimes you're completely innocent of. The professor gives a long-time police officer equal time to rebut. The officer not only agrees with the professor, but reveals a few "tricks of the trade" that officers use in interrogations to convict people whether they're guilty or not.
A fun video - the lawyer missed his career opportunity as an auctioneer. The cop steals the show. BTW: The cop is an "interviewer", not an "interrogator".

Regards

Mike