Keith Cotterill and Tess
Keith Cotterill is an English chap who has been interested in commodity Trading for many years.
Just found this article  
http://www.crbtrader.com/trader/v07n03/international.asp 
I too read 'Don't tell the Professionals' when it was in  its first print - typos and all. The theory is that only the big boys move the markets, so it's spotting when they, who can see things happen on the trading floor that we at home can't, then riding with them, but not lagging.
His system is (or certainly was) based on implied volatlity  as an indicator along with volume and different types of bars on the charts to  which he gives his own names.
Just before I read  the book i visited Keith at his home, (pre charging for his time days)  where he showed me some of the basics of  using his then Opticon and Volcon programmes that distributed volatility and volume data from knight ridder to rolling contracts for Supercharts. Presumably this sort of stuff has now developed into and is  integrated into hisTESS software if still used.
He was also a pal of Dave Caplan, options trader.
Also at that time he had a large 8 ft or so satellite dish in his garden to 'intercept' commodity data.
For the life of me i can't remember how i came to hear about/from him. This was before freely available info and data  on the internet - 1995 ish.
His web site doesn't  give much info out - is his system still based on implied volatitily, volume and price bars? If so, does it still tie you into buying data from K Ridder (Bridge these days?)
Whether Keith trades his system or not i haven't a clue as i haven't seen or spoken to him since then.
Cheers.
Graham.