Former Ambassador College teacher Sir Anthony Buzzard has moved on from his earlier treatment of the Trinity in a jointly authored volume with fellow Armstrong refugee Charles Hunting (currently unavailable on Amazon, but procurable from Atlanta Bible College), to a solo title of 400 pages called Jesus Was Not a Trinitarian.
The newer book appears to avoid some of the clangers that plagued the earlier tome. Buzzard is, of course, not arguing from a place of scholarly objectivity, but making a case for a biblical unitarianism. This is the perspective that is aired in the One God seminars organized by Ken Westby, and influential in unexpected corners of the WCG diaspora.
For a critical pro-trinitarian review of the book, click here. It appears however that the reviewer is every bit as one-eyed as the author he critiques. Provided you share the same assumptions Buzzard does - about the inspiration of the Bible and the factual status of the gospel accounts for example - he seems to make reasonable good sense.