Well, I’m not Dennis, but there seems to be a clear lack of understanding on your part here.
Dennis does the reading at the end of widely accepted close of the Forex trading day, 5 PM in New York, so that obviously is the BEST time.
Of course, Forex doesn’t actually “close” during the week, unless you count the 2 or 3 minutes the servers are reset, which happens to be 5 PM in New York and also when generate the daily daily statements.
So, back to the readings, obviously, taking a reading at any time during London session will result in a widely different ranking than a reading at the daily close, eg. 5 PM in New York.
Why? because, look at how far a pair can move from your supposed close of UK session and the actually daily close of 5 PM in New York.
Not saying it won’t work for you, but only you can log it for a few months and test it out; or go back and backtest perhaps?
Other than that, I don’t believe Dennis will support any other reading than 5 PM in New York, and he won’t be able to tell your the UK readings or spoon feed in you in any other way, good luck!