How does the Big Ben method work?
Big Ben was first described in use for trading the £/Euro and the basic method is in a journal article here -
http://www.traders-library.com/download/BigBen Trading Strategy.pdf
It's just a member of the opening range breakout strategies, such as used by Tony Crabel and Mark Fisher on commodities, forex and the S&P ETF's.
I'm concentrating on the FTSE100 index and the current rules are basically,
take 0800-0900 High (BBH) and Low (BBL)
at 0900, set entry orders long at BBH+2, sell at BBL - 2
set long target BBH+13, short target BBL-13
set long stop BBH-11, short stop BBL+11
cancel unexecuted entry orders at 1300
close positions still open at 1300
don't trade on days when US market is closed
don't trade if BB range today is > the average of the last 10 BB ranges
one BB trade per day
Be advised, win rate is 60-65% only, and r:r not quite 1.0. This will make a profit but stops are obligatory and keeping the risked capital per trade to a low % of account is essential.
Good luck.