That may have been true in the past Darky when bookies actually attempted to make an overround book, but it's not now, when most bookies set their prices according to the opening totes adding a few percentage points so that they invariably go up at 140% plus.

About five to seven minutes before the jump is now when bookies prices are meaningful but without a doubt, the most powerful ratings indicator are the prices on offer on Betfair with their 103% to 105% markets.