The school there teaches the students to use the greenbelts/clearings for crosswind, base legs and the dams to the north and the Steelmill buildings to the south as turning points.
Slightly off subject, but I've always thought its poor form to teach where to turn in the circuit based on ground features. Isn't it better to use a 'picture' of what the runway looks like at the different turn points to judge when to turn. Those ground features that students are taught aren't going to be much help when operating from a different airfield.