It's unlikely that you'll get much of a discount – it's a very new car that's in demand, and the global chip shortage means there's a shortage in supply of new models (although we've been told the Yaris Cross shouldn't be affected too badly). On the flip side, high demand for used cars means you should be able to get a good trade-in price for your old car. You might make more for it through a service like Motorway.co.uk: www.honestjohn.co.uk/how-to-buy-sell/what-is-motor.../