You definitely should switch. There are a bunch of Tesco products which are a fraction of the price of their branded counterparts and which are equal in quality. The ones I would buy regularly include: cooking oils, cornflakes (nicer than Kelloggs), tinned fish, rice and pastas, toilet rolls and tissues, washing up liquid, dishwasher and laundry tabs. A Quantum Finish dishwasher tab costs about six times the price of a Tesco All-In-One tab for arguably no improvement in performance (and certainly not a factor of six improvement).