'Proven Switch' definition: based on an alternative already adopted by some NHS Supply Chain customer(s), which offer the largest potential savings nationally (i.e. across all of NHS Supply Chain’s customers). Identified based on the purchase history of customers, where the sales have stopped on the primary product and then started on the identified alternative product. Forecasted savings have been calculated based on the band 1 price of the primary product (i.e. the products currently used by trusts) minus the band 1 price of the alternative product multiplied by the last 12 months actual quantity purchased where a switch has been detected (switch: where sales have stopped on the primary product and then started on the identified alternative product). Potential savings have been calculated based on the band 1 price of the primary product (i.e. the products currently used by trusts) minus the band 1 price of the alternative product multiplied by the last 12 months actual quantity purchased ‘No of trusts purchasing comparable products’ refers to NHS Supply Chain customers who already purchase the alternative product, this does not reflect the number of trusts who have made the switch from the primary to the alternative product. Trusts should check with clinical teams that the alternative product is suitable for its dedicated use in each instance. All savings and prices correct at time of publication.