The bit that made me think "sprawl" was past the motorway, around the John Lewis and the estates up there.
Hmm, I guess you have in mind Orchard Heights and round there, adjacent to the A20 and the Drovers Roundabout (with its cardboard cut out cows- we couldn't afford concrete ones like MK!) That is minute compared with the developments on the eastern and southern site of town. For the benefit of carlton43, John Lewis is where the old circus field was near Ashford Warren, which remains a lovely nature reserve though terribly hemmed in by developments, not least the motorway and the HS railway line which makes it rather noisy, and not the peaceful haven it once was. There are big constraints on development on that western side of town, compared with the south east where the town has swallowed up villages like Mersham, Great Chart and Kingsnorth.