Having scored on soft ground at Goodwood last time out, the Cape Cross gelding will attempt to claim a fourth win of the campaign on his first start at Listed level in the mile-and-a-quarter contest.
The Newmarket handler said: "Escalator is improving rapidly. The trip is fine, as is the ground, as he won on bottomless ground at Goodwood.
"As a three-year-old he carries very little weight, which in this ground means a lot, so there are a lot of positives and he is a very straightforward horse."
He added: "This race has been the plan since Goodwood. I've been pretty happy with him and we've had a clean run into the race.
"The ground was going to be quick enough at Newbury for the races he was entered in down there, and we know that he acts well with cut in the ground."
Roger Charlton expects Aspetar to take a step forward for the run, having not been sighted since losing his unbeaten status in a Group Two in Deauville back in June.
He said: "He has been waiting for this soft ground since his run in France, where the ground was a bit too quick for him. We know he handles soft, but whether he handles heavy, which it could be, I don't know.
"It does look a tough race and he will come on for it. He is a mile-and-a-half horse, really, but we don't really have many chances over that trip for him.
"He won well at Goodwood on his penultimate start and he didn't really do much wrong in France, just the ground was a bit quick."
Saeed bin Suroor bids for a sixth win in the race with the hat-trick-seeking Dubai Horizon, while Ralph Beckett will be double-handed through last year's Cambridgeshire winner Dolphin Vista and multiple Group-race scorer Air Pilot.
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