Just finished the unabridged audiobook version of 'The Rendlesham Forest Incident' narrated by Carwardine (Audible, about £8.99). It's a properly detailed account of the 1980 events at RAF Bentwaters, with lots of primary source material and interviews that I hadn't encountered before despite reading around this topic for years.
The narration is excellent - Carwardine does different voices for the witness interviews which sounds gimmicky but actually makes it easier to follow. The book itself is well-researched and doesn't jump to conclusions. It presents the evidence and lets you make up your own mind. There's a good section on the declassified documents and the various attempts to recreate the phenomenon.
Only criticism: it's quite long (about 14 hours) and some of the technical analysis sections get a bit dense if you're not into that sort of detail. But overall I'd recommend this to anyone seriously interested in the incident who hasn't read it yet. Better than a lot of the sensationalist UFO docs out there.