How tall are the towers at the oil refinery at erith edible oils factory?

The shadow of the tallest tower at Erith Edible Oils, Church Manorway, Erith, Kent appears to be about 200 meters long on Google Earth. Judging by the other shadows, the time of day is morning and the time of year is winter and the other shadows appear to be somewhat longer than the structures making them. So the height of the towers is probably between 130 meters and 170 meters. To get a more exact answer either contact Erith Edible Oils and ask them or reference an aviation map for Kent.