Sorry Matt, I ment Jamie not you. Jamies confused Clarkey by saying the sensor is an option when in fact as I, and Ahmedf said it's the Rod length that's the option.
Jamie said "Fit the sensor to the rod (not supplied in the kit and is an extra £15)" fit the sensor (not supplied in the kit) would mean the sensor is not supplied the brackets after the rod mean that's not supplied Hope this helps