I've got a 2019 Seat Ibiza with about 40k miles I paid about £13k for about 4 years ago with about 3k miles on the clock. We buy any car reckons it's worth £10k so I'm sure I could get about £11k-£12k part exchange. I'm part tempted to downgrade to a car worth about £5-6k which the Seat still has some value.