I am looking at the [[www.screwfix.com/p/insinkerator-model-45-economy-food-waste-disposer/38067?cm_mmc=AffiliateWindow-_-DeepLink-_-Na-_-Na&source=aw&awc=1228_1407106734_72b1aa441f584255fafe337efa1ca85feconomy model 45]] and can't work out how you start/stop it. Surely it needs a switch of some sort?