That was a difficult day...
Cockney Rebel was 28lbs faster than Beaver Patrol, suggesting it was extraordinarily fast, but it made everything else look far too fast for its class too, so BP's race must have been pretty slow in reality.
I then came up with a GA which would allow Aqmaar a time rating on a par with its form rating, and Cockney Rebel still emerged as top drawer. This seemed promising and everything looked rosy with Aqmaar, Echelon and Cockney Rebel all putting up appropriate-looking times vis a vis their form figures. However, it made Salford Mill uncomforably fast (for me). A lto of people went with that figure and SM was widely touted for the Dante and Derby, iirc., but I couldn't get my head round it: it still mde the beaten horses behind SM awful fast.
Eventually, I bit the bullet and went with the view that SM had run the true race that day - ie nowhere near as fast as suggested - which made the going allowance -0.43spf, indicating very fast conditions. It put Cockney Rebel back in the pack of average Guineas winners at 110+ wfa (13lbs), or 123 outright, which I felt was about right.
My GA for Newmarket last weekend, by the way, was -0.39spf, so you're right. Not much in it and very fast conditions, for whatever reason.